View source for Windows Phone

{{Short description|Family of mobile operating systems developed by Microsoft}}
{{Use mdy dates|date=April 2012}}
{{Infobox OS
| name = Windows Phone
| family = [[Microsoft Windows]]
| logo = [[File:Windows Phone 8 logo and wordmark (purple).svg|240px]]
| logo caption = 
| screenshot = [[File:WP8.1 Start Screen.png|240px]]
| caption = An example of a custom Start screen on [[Windows Phone 8.1]]
| working_state = Discontinued<ref name="eos">{{cite web|url=https://www.theverge.com/2017/7/11/15952654/microsoft-windows-phone-end-of-support|title=Windows Phone dies today|website=theverge.com|date=July 11, 2017}}</ref>
| source_model = [[Closed-source]]
| released = <!-- "GA_date" --> {{vgrelease|WW|{{date range and age in years, months, weeks and days|2010|10|21|2020|01|14}}|US|November 8, 2010}}
| discontinued = {{End date|2017|07|11}}<ref name="eos"/>
| latest release version = 8.1 Update 2 (8.10.15148.160)<ref>{{cite web|url=https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id=a81d90ac-aa75-4cf8-b14c-58bf348528fe&redirect_uri=https%3A%2F%2Fanswers.microsoft.com&response_type=code%20id_token&scope=openid%20profile&state=OpenIdConnect.AuthenticationProperties%3DGu2u2xAnw70qTthpVZSfKTC8m4-5vF7z3K-JzeuMI0XkWYxclTDGN2e34CTe0NEHfFoUnt4lxW_gUzBRv_5uh72uSBxfrEGihPU6o-XMjYq7lx1_NCVOvVpD6Mzk3CBZpTa0obmEOfeIPVo27g93QR1eKxmqm-9R8aQQoSGnmXlcpbwjNP_fs_2U-ZudHP9817gSobhPSaTNabV0UhTBpa9CKQRfkmtcj_JkAEjT6UJbqBqh9PvM2-8BlCL0MxG_&response_mode=form_post&nonce=638776464662483136.MDQ4N2I1ZjYtZTc5Mi00YmJiLWEzZTQtZWJiNWRkZGRlZjAyMzMxNDZkN2QtZGJkYy00NmViLThmODYtNjU1YzgwY2Y2ZTBj&nopa=2&prompt=none&x-client-SKU=ID_NET472&x-client-ver=7.6.0.0|title=New software update for Lumia 640 & Lumia 640 XL: 02177.00000.15184.36xxx/8.10.15148.160|website=answers.microsoft.com}}</ref>
| latest release date = {{start date and age|2015|6|2}}
| preview_version = 
| preview_date = 
| language = 130 languages<ref name="languages">{{cite web|url=http://blogs.technet.com/b/terminology/archive/2012/06/20/windows-phone-8-announced-today-will-support-50-languages.aspx|title=Windows Phone 8 announced today: will support 50 languages|first=Palle|last=Petersen|date=June 20, 2012|work=[[Microsoft Language Portal]] Blog|publisher=[[Microsoft]]|access-date=July 21, 2012|archive-url=https://web.archive.org/web/20120625230451/http://blogs.technet.com/b/terminology/archive/2012/06/20/windows-phone-8-announced-today-will-support-50-languages.aspx|archive-date=June 25, 2012|url-status=dead}}</ref>
| developer = [[Microsoft]]
| programmed_in = [[C (programming language)|C]], [[C++]], [[Assembly Language]], [[C Sharp (programming language)|C#]]<ref>{{cite web|url=http://www.lextrait.com/Vincent/implementations.html |title=The Programming Languages Beacon, v10.0 |first=Vincent |last=Lextrait |date=February 2010 |access-date=February 12, 2010 |url-status=dead |archive-url=https://archive.today/20120530/http://www.lextrait.com/Vincent/implementations.html |archive-date=May 30, 2012 }}</ref>
| license = [[Commercial software|Commercial]] [[proprietary software]]
| kernel type = [[Hybrid kernel|Hybrid]] ([[Monolithic kernel|Monolithic]] in [[Windows Phone 7]])
| supported_platforms = [[Qualcomm Snapdragon]]
| updatemodel = [[Zune Software]] (Windows Phone 7), [[Firmware over the air]] (Windows Phone 8+)
| package manager = [[Windows Phone Store]]<ref>{{Cite web |last=Warren |first=Tom |date=2014-02-11 |url=https://www.theverge.com/2014/2/11/5400660/windows-phone-8-1-features-leaked |title=Windows Phone 8.1 includes universal apps and lots of feature updates |work=[[The Verge]] |publisher=[[Vox Media]]}}</ref>
| preceded_by = [[Windows Mobile]], [[Zune]]
| succeeded_by = [[Windows 10 Mobile]]
| website = {{webarchive |url=https://web.archive.org/web/*/http://www.windowsphone.com/ |date=* |title=Archived official website }}
| support status = Unsupported, see [[Windows Phone#Versions|§ Versions]] for details
}}

'''Windows Phone''' ('''WP''') is a discontinued<ref name="auto">{{Cite news|last=Reilly|first=Claire|url=https://www.cnet.com/news/windows-10-mobile-features-hardware-death-sentence-microsoft/|title=Windows 10 Mobile gets its final death sentence|date=2017-10-08|work=CNET|access-date=2017-10-09}}</ref> [[mobile operating system]] developed by [[Microsoft]] for [[smartphones]] as the replacement successor to [[Windows Mobile]]<ref name="Q&A">{{cite web|url=http://asia.cnet.com/reviews/mobilephones/0,39050603,62061278,00.htm |title=Q&A: Microsoft on Windows Phone 7 |first=Damian |last=Koh |work=[[CNET|CNET Asia]] |publisher=[[CBS Interactive]] |date=February 18, 2010 |access-date=June 3, 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100221162152/http://asia.cnet.com/reviews/mobilephones/0%2C39050603%2C62061278%2C00.htm |archive-date=February 21, 2010 }}</ref><ref>{{cite web|url=https://www.engadget.com/2010/03/04/microsoft-talks-windows-phone-7-series-development-ahead-of-gdc/ |title=Microsoft talks Windows Phone 7 Series development ahead of GDC: Silverlight, XNA, and no backward compatibility |first= Chris |last= Ziegler |work= [[Engadget]] |publisher=[[AOL]] |date= March 4, 2010 |access-date=October 27, 2011}}</ref> and [[Zune]].<ref name=CNet>{{cite news|last=Bell|first=Donald|title=Zune services going global with Windows phone|url=http://www.cnet.com/news/zune-services-going-global-with-windows-phone/#!|newspaper=CNet|date=16 February 2010}}</ref> Windows Phone featured a new user interface derived from the [[Metro design language]]. Unlike Windows Mobile, it was primarily aimed at the consumer market rather than the [[enterprise software|enterprise]] market.<ref>{{cite web |url= https://arstechnica.com/microsoft/news/2010/03/windows-phone-7-series-in-the-enterprise-not-all-good-news.ars |title= Windows Phone 7 Series in the Enterprise: not all good news |first= Peter |last= Bright |work=[[Ars Technica]] |publisher= [[Condé Nast Publications|Condé Nast Digital]] |date= March 16, 2010 |access-date=November 20, 2010}}</ref>

It was first launched in October 2010 with [[Windows Phone 7]].<ref>{{cite web |url= https://www.engadget.com/2010/09/26/microsoft-prepping-windows-phone-7-for-an-october-21st-launch/ |title= Microsoft prepping Windows Phone 7 for an October 21 launch? (update: US on Nov. 8?) |first= Sean |last= Hollister |work=[[Engadget]] |publisher= [[AOL]] |date= September 26, 2010 |access-date=September 29, 2010}}</ref> [[Windows Phone 8]] succeeded it in 2012, replacing the [[Windows CE]]-based kernel of Windows Phone 7 with the [[Windows NT]] kernel used by the PC versions of [[Microsoft Windows|Windows]] (and, in particular, a large amount of internal components from [[Windows 8]]). Due to these changes, the OS was incompatible with all existing Windows Phone 7 devices, although it still supported apps originally developed for Windows Phone 7. In 2014, Microsoft released the [[Windows Phone 8.1]] update, which introduced the [[Cortana (virtual assistant)|Cortana]] [[virtual assistant]], and [[Windows Runtime]] platform support to create cross-platform apps between Windows PCs and Windows Phone.<ref>{{Cite web|url=https://www.theverge.com/2014/2/11/5400660/windows-phone-8-1-features-leaked|title=Windows Phone 8.1 includes universal apps and lots of feature updates|last=Warren|first=Tom|date=2014-02-11|website=The Verge|language=en|access-date=2020-02-28}}</ref>

In 2015, Microsoft released [[Windows 10 Mobile]], which promoted increased integration and unification with its [[Windows 10|PC counterpart]], including the ability to connect devices to an external display or [[docking station]] to display a PC-like interface. Although Microsoft dropped the Windows Phone brand at this time in order to focus more on synergies with Windows 10 for PCs, it was still a continuation of the Windows Phone line from a technical standpoint, and updates were issued for selected Windows Phone 8.1 devices.

While Microsoft's investments in the platform were headlined by a major partnership with [[Nokia]] (whose [[Microsoft Lumia|Lumia series]] of smartphones, including the [[Nokia Lumia 520|Lumia 520]] in particular, would represent the majority of Windows Phone devices sold by 2013)<ref name="PocketNowNokia90percent">{{cite news|last=Rivera|first=Jaime|url=http://pocketnow.com/2013/10/18/nokia-owns-90-of-the-windows-phone-market-share|title=Nokia owns 90% of the Windows Phone market share.|date=18 October 2013|newspaper=PocketNow|access-date=February 28, 2020|archive-date=November 16, 2017|archive-url=https://web.archive.org/web/20171116181156/http://pocketnow.com/2013/10/18/nokia-owns-90-of-the-windows-phone-market-share|url-status=dead}}</ref> and Microsoft's eventual acquisition of the company's mobile device business for just over [[United States dollar|US$]]7 billion (which included Nokia's then-CEO [[Stephen Elop]] joining Microsoft to lead its [[Microsoft Mobile|in-house mobile division]]), the duopoly of [[Android (operating system)|Android]] and [[iPhone]] remained the dominant platforms for smartphones, and interest in Windows Phone from app developers began to diminish by mid-decade.<ref>{{Cite web|url=https://www.theverge.com/2015/10/23/9602350/microsoft-windows-phone-app-removal-windows-store|title=Windows Phone has a new app problem|last=Warren|first=Tom|date=2015-10-23|website=The Verge|language=en|access-date=2020-02-26}}</ref> Microsoft laid off the Microsoft Mobile staff in 2016,<ref>{{Cite web|url=https://www.theverge.com/2016/5/25/11766344/microsoft-nokia-impairment-layoffs-may-2016|title=Microsoft lays off hundreds as it guts its phone business|last=Warren|first=Tom|date=2016-05-25|website=The Verge|language=en|access-date=2020-02-26}}</ref> after having taken a [[write-off]] of $7.6 billion on the acquired Nokia hardware assets,<ref>{{Cite web|url=https://www.theverge.com/2015/7/8/8910999/microsoft-job-cuts-2015-nokia-write-off|title=Microsoft writes off $7.6 billion from Nokia deal, announces 7,800 job cuts|last=Warren|first=Tom|date=2015-07-08|website=The Verge|language=en|access-date=2020-02-26}}</ref> while market share sank to 1% that year.<ref>{{Cite web|url=https://www.theverge.com/2016/5/23/11743594/microsoft-windows-phone-market-share-below-1-percent|title=Windows Phone market share sinks below 1 percent|first=Tom|last=Warren|date=May 23, 2016|website=The Verge}}</ref> Microsoft began to prioritize software development and integrations with Android and iOS instead,<ref>{{Cite web|url=https://www.theverge.com/2018/10/3/17933644/microsoft-android-apps-windows-10-app-mirroring-report|title=Microsoft is embracing Android as the mobile version of Windows|last=Warren|first=Tom|date=2018-10-03|website=The Verge|language=en|access-date=2020-02-28}}</ref> and ceased active development of Windows 10 Mobile in 2017.<ref name="cnet-winmobile-byebye" />

==History==

===Development===
Work on a major [[Windows Mobile]] update may have begun as early as 2004 under the codename "Photon", but work moved slowly and the project was ultimately cancelled.<ref>{{cite web |url= https://gizmodo.com/5480387/what-windows-phone-7-could-have-been |title= What Windows Phone 7 Could Have Been |first= John |last= Herrman |work=[[Gizmodo]] |publisher= [[Gawker Media]] |date= February 25, 2010 |access-date=June 5, 2010}}</ref> In 2008, Microsoft reorganized the Windows Mobile group and started work on a new mobile operating system.<ref>{{cite web |url= http://pocketnow.com/thought/thoughts-on-windows-phone-7-series-btw-photon-is-dead |title= Thoughts on Windows Phone 7 Series (BTW: Photon is Dead) |first= Brandon |last= Miniman |work= Pocketnow |date= February 17, 2010 |access-date= June 5, 2010 |archive-date= October 29, 2013 |archive-url= https://web.archive.org/web/20131029192149/http://pocketnow.com/thought/thoughts-on-windows-phone-7-series-btw-photon-is-dead |url-status= dead }}</ref> The product was to be released in 2009 as Windows Phone, but several delays prompted Microsoft to develop Windows Mobile 6.5 as an interim release.<ref name="MTW_Steve">{{cite web |url= http://www.mobiletechworld.com/2009/09/24/steve-ballmer-wishes-windows-mobile-7-had-already-launched-but-they-screwed-up/ |title= Steve Ballmer wishes Windows Mobile 7 had already launched, but they screwed up |work= MobileTechWorld |date= September 24, 2009 |access-date= July 21, 2012 |archive-url= https://web.archive.org/web/20131104214039/http://www.mobiletechworld.com/2009/09/24/steve-ballmer-wishes-windows-mobile-7-had-already-launched-but-they-screwed-up/ |archive-date= November 4, 2013 |url-status= dead }}</ref>

Following this, Windows Phone was developed quickly. One result was that the new OS would not be compatible with Windows Mobile applications. Larry Lieberman, senior product manager for Microsoft's Mobile Developer Experience, told [[eWeek]]: "If we'd had more time and resources, we may have been able to do something in terms of backward compatibility."<ref name="eWeek_Explains">{{cite web |url=http://www.eweek.com/c/a/Mobile-and-Wireless/Microsoft-Explains-Windows-Phone-7-Lack-of-Compatibility-588900/ |title=Microsoft Explains Windows Phone 7 Lack of Compatibility |first= Nicholas |last= Kolakowski |date= March 15, 2010 |work= [[eWeek]] |publisher= [[Ziff Davis|Ziff Davis Media]]}}</ref> Lieberman said that Microsoft was attempting to look at the mobile phone market in a new way, with the [[end user]] in mind as well as the enterprise network.<ref name="eWeek_Explains"/> [[Terry Myerson]], corporate VP of Windows Phone engineering, said, "With the move to capacitive touch screens, away from the stylus, and the moves to some of the hardware choices we made for the Windows Phone 7 experience, we had to break application compatibility with Windows Mobile 6.5."<ref name="TerryMyerson_explains">{{cite video |first1= Augusto |last1= Valdez |first2= Terry |last2= Myerson |author-link2= Terry Myerson |date= June 7, 2010 |title= Windows Phone 7: A New Kind of Phone |url= http://channel9.msdn.com/Events/TechEd/NorthAmerica/2010/WPH201 |publisher= [[Microsoft]] |access-date= September 9, 2010 |time= 36:47 |archive-date= December 3, 2011 |archive-url= https://web.archive.org/web/20111203225535/http://channel9.msdn.com/Events/TechEd/NorthAmerica/2010/WPH201 |url-status= dead }}</ref>

From the beginning of Windows Phone until at least 2015, [[Joe Belfiore]] was the head of development and the face of the platform's initiatives.<ref>{{Cite web|url=https://www.onmsft.com/news/joe-belfiore-former-head-of-windows-phone-development-upsets-fans-and-users-again|title=Joe Belfiore, former head of Windows Phone development, upsets fans and users again|date=July 27, 2017}}</ref>

===Partnership with Nokia===
{{Main|Microsoft Mobile}}
{{Further|Microsoft Lumia}}
On February 11, 2011, at a press event in London, Microsoft CEO [[Steve Ballmer]] and [[Nokia]] CEO [[Stephen Elop]] announced a partnership between their companies in which Windows Phone would become the primary smartphone operating-system for Nokia, replacing [[Symbian]].<ref name="microsoft.com">
{{cite web |title= Nokia and Microsoft Announce Plans for a Broad Strategic Partnership to Build a New Global Mobile Ecosystem |url= https://news.microsoft.com/2011/02/10/nokia-and-microsoft-announce-plans-for-a-broad-strategic-partnership-to-build-a-new-global-mobile-ecosystem/ |work=News Center|publisher= [[Microsoft]] |date= February 10, 2011 |access-date= October 27, 2011}}</ref> The event focused largely on setting up "a new global mobile ecosystem", suggesting competition with [[Android (operating system)|Android]] and [[IOS (Apple)|iOS]] with the words "It is now a three horse race". Elop stated the reason for choosing Windows Phone over Android, saying: "the single most important word is 'differentiation'. Entering the [[Google Android|Android]] environment late, we knew we would have a hard time differentiating."<ref name="cheng1">{{cite web|last=Cheng |first=Roger |url=http://news.cnet.com/8301-1035_3-57559620-94/nokia-on-the-edge-inside-an-icons-fight-for-survival/ |title=Nokia on the edge: Inside an icon's fight for survival|work=[[CNET]]|publisher=[[CBS Interactive]] |date=December 18, 2012 |access-date=June 14, 2013}}</ref> While Nokia would have had more long-term creative control with Android ([[MeeGo]] as used by Nokia resembles Android more than it does Windows Phone 7 as both Android and MeeGo are based on the [[Linux]] kernel), Elop enjoyed familiarity with his past company where he had been a top executive.<ref>{{cite news |last=Weintraub |first=Seth |url=http://tech.fortune.cnn.com/2011/02/08/nokias-elop-drops-bomb-the-platform-is-on-fire/ |title=Nokia's Elop drops bomb: the platform is on fire |publisher=[[CNN]] |date=2011-02-08 |access-date=2013-06-14 |archive-date=June 27, 2013 |archive-url=https://web.archive.org/web/20130627165328/http://tech.fortune.cnn.com/2011/02/08/nokias-elop-drops-bomb-the-platform-is-on-fire/ |url-status=dead }}</ref><ref>{{cite web|author=Latest Video |url=http://allthingsd.com/20110601/why-windows-phone-instead-of-android-nokia-ceo-stephen-elop-explains/ |title=Nokia CEO Stephen Elop Chooses Microsoft Windows Phone OS Over Android - John Paczkowski - D9 |publisher=AllThingsD |date=2011-06-01 |access-date=2013-06-14}}</ref>

The pair announced integration of Microsoft services with Nokia's own services; specifically:<ref name="microsoft.com"/>

*[[Bing (search engine)|Bing]] would power search across Nokia devices
*integration of Nokia Maps with Bing Maps
*integration of Nokia's [[Ovi (Nokia)|Ovi store]] with the [[Windows Phone Store]]

The partnership involves "funds changing hands for royalties, marketing and ad-revenue sharing", which Microsoft later announced as "measured in billions of dollars".<ref>{{cite web |title= Nokia and Microsoft Sign Definitive Agreement Ahead of Schedule |url= https://news.microsoft.com/2011/04/21/nokia-and-microsoft-sign-definitive-agreement-ahead-of-schedule/ |work=News Center|publisher= [[Microsoft]] |date= April 21, 2011 |access-date= October 27, 2011}}
</ref> [[Jo Harlow]], whom Elop tapped to run Nokia's smartphone business, rearranged her team to match the structure led by Microsoft's VP of Windows Phone, [[Terry Myerson]]. Myerson was quoted as saying, "I can trust her with what she tells me. She uses that same direct and genuine communication to motivate her team."<ref>{{cite news|last=Lev |first=Michal |url=http://tech.fortune.cnn.com/2012/09/05/nokia-lumia-smartphone/ |title=Can the Lumia smartphone save Nokia? - Fortune Tech |publisher=[[CNN]] |date=September 5, 2012 |access-date=2013-06-14|url-status=dead|archive-url=https://web.archive.org/web/20120907072757/http://tech.fortune.cnn.com/2012/09/05/nokia-lumia-smartphone/|archive-date=September 7, 2012}}</ref>

The first Nokia Lumia Windows Phones, the [[Lumia 800]] and [[Lumia 710]], were announced in October 2011 at Nokia World 2011.<ref>{{cite news |url= https://www.bbc.co.uk/news/technology-15460569 |title= Nokia's First Windows Phone 7 Handset |first= Rory |last= Cellan-Jones |work= [[BBC News Online]] |publisher= BBC |date= October 26, 2011 |access-date= July 21, 2012}}</ref><ref>{{cite web |url= http://www.governor.co.uk/news-plus-views/2011/10/31/nokia-windows-phone-launch-in-uk |title= Nokia's Windows Phone announced alongside the 800, hitting select markets by end of year |first= Charlotte |last= Haeger |work= Governor Technology |date= October 31, 2011 |access-date= October 31, 2011|url-status=dead|archive-url=https://web.archive.org/web/20120425233819/http://www.governor.co.uk/news-plus-views/2011/10/31/nokia-windows-phone-launch-in-uk|archive-date=April 25, 2012}}</ref>

At the [[Consumer Electronics Show]] in 2012 Nokia announced the [[Lumia 900]], featuring a 4.3-inch AMOLED ClearBlack display, a 1.4&nbsp;GHz processor and 16&nbsp;GB of storage.<ref>{{cite web |url= http://www.nokia.com/us-en/products/phone/lumia900/specifications/ |title= Detailed specifications for the Nokia Lumia 900 |publisher= [[Nokia]] |access-date= July 21, 2012|url-status=dead|archive-url=https://web.archive.org/web/20120113065403/http://www.nokia.com/us-en/products/phone/lumia900/specifications|archive-date=January 13, 2012}}</ref> The Lumia 900 was one of the first Windows Phones to support LTE and was released on AT&T on April 8, 2012.<ref>{{cite web |url= http://conversations.nokia.com/2012/03/26/mark-your-calendars-nokia-lumia-900-available-for-purchase-in-the-us/ |title= Mark your calendars: Nokia Lumia 900 available for purchase in the US |first= Jason |last= Harris |work= Conversations by Nokia |publisher= [[Nokia]] |date= March 26, 2012 |access-date= July 21, 2012|url-status=dead|archive-url=https://web.archive.org/web/20120328172933/http://conversations.nokia.com/2012/03/26/mark-your-calendars-nokia-lumia-900-available-for-purchase-in-the-us/|archive-date=March 28, 2012}}</ref> An international version launched in Q2 2012, with a UK launch on May 11, 2012.<ref>{{cite web |url= http://www.gizmodo.co.uk/2012/03/nokia-lumia-900-priced-and-dated-for-a-may-landing-in-the-uk/ |title= Nokia Lumia 900 Priced and Dated For a May Landing in the UK |first= Sam |last= Gibbs |work= [[Gizmodo|Gizmodo UK]] |publisher= [[Future plc|Future Publishing]] |date= March 1, 2012 |access-date= July 21, 2012}}</ref> The [[Lumia 610]] was the first Nokia Windows Phone to run the Tango Variant (Windows Phone 7.5 Refresh) and was aimed at emerging markets.

On September 2, 2013, Microsoft announced a [[Nokia#Acquisition of mobile phone division by Microsoft|deal]] to acquire Nokia's mobile phone division outright, retaining former CEO Stephen Elop as the head of Microsoft's devices operation.<ref name=ms-nokia>{{cite web|title=The Next Chapter: An open letter from Steve Ballmer and Stephen Elop|url=http://blogs.technet.com/b/microsoft_blog/archive/2013/09/02/the-next-chapter-an-open-letter-from-steve-ballmer-and-stephen-elop.aspx|work=The Official Microsoft Blog|publisher=[[Microsoft]]|access-date=3 September 2013|first=Michael|last=Wann|archive-url=https://web.archive.org/web/20130904172756/http://blogs.technet.com/b/microsoft_blog/archive/2013/09/02/the-next-chapter-an-open-letter-from-steve-ballmer-and-stephen-elop.aspx|archive-date=September 4, 2013|url-status=dead}}</ref><ref name=verge-msnokia>{{cite web|title=Microsoft buys Nokia's Devices and Services Unit, unites Windows Phone 8 and its hardware maker|url=https://www.theverge.com/2013/9/2/4688530/microsoft-buys-nokias-devices-and-services-unit-unites-windows-phone|work=[[The Verge]]|date=September 2, 2013|publisher=[[Vox Media]]|first=David|last=Pierce|access-date=3 September 2013}}</ref> The merger was completed after regulatory approval in all major markets in April 2014. As a result, Nokia's hardware division became a subsidiary of Microsoft operating under the name [[Microsoft Mobile]].

In February 2014, Nokia released [[Nokia X family|the Nokia X series of smartphones]] (later discontinued) using a version of Android forked from the Android Open Source Project. The operating system was modified; Google's software was not included in favour of competing applications and services from Microsoft and Nokia, and with a user interface highly modified to resemble Windows Phone.<ref>{{cite web|last=Warren |first=Tom |url=https://www.theverge.com/2014/2/24/5440498/nokia-x-android-phone-hands-on |title=This is Nokia X: Android and Windows Phone collide |work=[[The Verge]]|publisher=[[Vox Media]] |date=February 24, 2014 }}</ref>

==Versions==
{{main|Windows Phone version history}}
{| class="wikitable"
|+
!Version
!Marketing name
!Announcement date
!Release date
!EOL date
!Support lifespan
|-
! rowspan="3" |CE 6.0
|Windows Phone 7
|February 15, 2010
|November 8, 2010
|January 8, 2013
|
|-
|Windows Phone 7.5
|February 22, 2011
|September 27, 2011
| rowspan="2" |October 14, 2014
|
|-
|Windows Phone 7.8
|June 20, 2012
|February 1, 2013
|
|-
!NT 6.2
|Windows Phone 8
|June 20, 2012
|October 29, 2012{{Efn|Released shortly after Windows 8.|name=Windows 8|group=upper-alpha}}
|January 12, 2016
|
|-
!NT 6.3
|Windows Phone 8.1
|April 14, 2014{{Efn|Originally scheduled after its PC counterpart, but delayed due to the release of iOS 7.1.|name=iOS 7.1|group=upper-alpha}}
|August 4, 2014
|July 11, 2017
|
|-
!NT 10.0
|Windows 10 Mobile
|November 20, 2015
|March 17, 2016
|January 14, 2020{{Efn|Originally scheduled on December 10, 2019, but delayed following one more security update due to the release of iOS 13.3. Supported until January 10, 2023 via the paid Extended Security Updates service.|name=Delayed end of support|group=upper-alpha}}
|
|}
{{Notelist}}

===Windows Phone 7===
[[File:Windows Phone 7 logo and wordmark.svg|thumb|right|200px|Logo used for Windows Phone 7.5 and Windows Phone 7.8]]
{{Main|Windows Phone 7}}
Windows Phone 7 was announced at [[Mobile World Congress]] in Barcelona, Catalonia, Spain, on February 15, 2010, and released publicly on November 8, 2010 in the [[United States]].

In 2011, Microsoft released Windows Phone 7.5 ''Mango''. The update included a mobile version of [[Internet Explorer 9]] that supports the same web standards and graphical capability as the desktop version, [[Computer multitasking|multi-tasking]] of third-party apps,<ref>{{cite web |url= https://www.engadget.com/2011/02/14/windows-phone-7s-multitasking-uses-cards/ |title= Windows Phone 7's multitasking uses zoomed-out cards to check on your apps |first= Tim |last= Stevens |date= February 14, 2011 |work= [[Engadget]] |publisher= [[AOL]] |access-date= March 24, 2011}}</ref><ref name = "CNET_20110214">{{cite web |url= http://reviews.cnet.com/8301-13970_7-20031778-78.html |title= Multitasking, IE9 coming to Windows Phone |first= Bonnie |last= Cha |work= [[CNET]] |publisher= [[CBS Interactive]] |date= February 14, 2011 |access-date= March 24, 2011 |archive-url= https://web.archive.org/web/20120426153947/http://reviews.cnet.com/8301-13970_7-20031778-78.html |archive-date= April 26, 2012 |url-status= dead }}</ref> Twitter integration for the People Hub,<ref>{{cite web |last= Bright |first= Peter |url= https://arstechnica.com/microsoft/news/2011/02/windows-phone-7s-future-revealed-at-last-multitasking-ie9-twitter.ars |title= Windows Phone 7's future revealed: multitasking, IE9, Twitter |work= [[Ars Technica]] |publisher= [[Condé Nast Publishing|Condé Nast Digital]] |date=February 14, 2011 |access-date= October 27, 2011}}</ref><ref>{{cite web |last= Mathews |first= Lee |url= http://downloadsquad.switched.com/2011/02/14/windows-phone-7-updates-bringing-twitter-and-skydrive-integratio/ |archive-url= https://archive.today/20120707144335/http://downloadsquad.switched.com/2011/02/14/windows-phone-7-updates-bringing-twitter-and-skydrive-integratio/ |url-status= dead |archive-date= July 7, 2012 |title= Windows Phone 7 update to bring Twitter and SkyDrive integration, webOS style multitasking |publisher= [[AOL]] |work= Switched |date= February 14, 2011 |access-date= October 27, 2011 }}</ref><ref>{{cite web |url= https://www.engadget.com/2011/02/14/windows-phone-7s-multitasking-uses-cards/ |title= Windows Phone 7's multitasking uses zoomed-out cards to check on your apps |first= Tim |last= Stevens |date= February 14, 2011 |publisher= [[AOL]] |work= [[Engadget]] |access-date= March 24, 2011}}</ref> and [[Windows Live SkyDrive]] access.<ref>{{cite web |url= http://www.wpcentral.com/new-features-heading-windows-phone-7-multi-tasking-IE9-Skydrive |title= New features heading to Windows Phone 7: Multi-tasking, IE9, Skydrive and more |first= George |last= Ponder |work= WPCentral.com |publisher= Mobile Nations |date= February 14, 2011 |access-date= October 27, 2011}}</ref> A minor update released in 2012 known as "Tango", along with other bug fixes, lowered the hardware requirements to allow for devices with 800&nbsp;MHz CPUs and 256 MB of RAM to run Windows Phone.<ref>{{cite web |title= Windows Phone 7.5 update will support 256MB RAM and slower processors in April |url= https://www.theverge.com/2012/2/27/2826832/windows-phone-256mb-ram-slow-processors |first= Tom |last= Warren |work= [[The Verge (website)|The Verge]] |publisher= [[Vox Media]] |date= February 27, 2012 |access-date= 21 June 2012}}</ref>

Windows Phone 7 devices can not be upgraded to Windows Phone 8 due to hardware limitations. Windows Phone 7.8 was released as a stopgap update in 2013 to include some of the user interface features from Windows Phone 8.<ref>{{Cite web|url=https://www.theverge.com/2012/6/20/3096945/windows-phone-7-8-upgrade-no-windows-phone-8-existing-devices|title=Microsoft: no upgrades to Windows Phone 8, but some features will come in Windows Phone 7.8|last=Warren|first=Tom|date=2012-06-20|website=The Verge|language=en|access-date=2020-02-28}}</ref>

===Windows Phone 8===
[[File:Windows Phone 8 logo and wordmark (purple).svg|thumb|right|200px|Logo used for Windows Phone 8 and Windows Phone 8.1]]
{{Main|Windows Phone 8}}
On October 29, 2012, Microsoft released '''Windows Phone 8''', a new generation of the operating system. Windows Phone 8 replaced its previously Windows CE-based architecture with one based on the [[Windows NT]] kernel with many components shared with [[Windows 8]].

===Windows Phone 8.1===
{{Main|Windows Phone 8.1}}
Windows Phone 8.1 was announced on April 2, 2014, after being released in preview form to developers on April 10, 2014.<ref>{{cite web | last=Warren | first=Tom | title=Microsoft begins sharing Windows Phone 8.1 with developers | website=The Verge | date=2014-02-10 | url=https://www.theverge.com/2014/2/10/5399264/microsoft-begins-sharing-windows-phone-8-1-with-developers | access-date=2019-11-04}}</ref><ref>{{cite web | last=Siegal | first=Jacob | title=Windows Phone 8.1 leaks unveil a host of new features | website=BGR | date=2014-02-11 | url=https://bgr.com/2014/02/11/windows-phone-8-1-leaks/ | access-date=2019-11-04}}</ref><ref>{{cite web | url=http://www.techradar.com/news/phone-and-communications/mobile-phones/nokia-lumia-630-running-windows-phone-8-1-reportedly-makes-video-debut-1238077 | title=Nokia Lumia 630 running Windows Phone 8.1 reportedly makes video debut | work=TechRadar | access-date=March 29, 2014}}</ref> New features added include a notification center, support for the [[Internet Explorer 11]] web browser, with tab syncing among [[Windows 8.1]] devices, separate volume controls, and the option to skin and add a third column of live tiles to the Start Screen. Starting with this release, Microsoft dropped the requirement that all Windows Phone OEMs include a camera button and physical buttons for back, Start, and Search.

Windows Phone 8.1 introduced [[Microsoft Cortana|Cortana]], a voice assistant similar to [[Siri]] and [[Google Now]]. Cortana replaced the previous Bing search feature, and was released as a beta in the United States in the first half of 2014, before expanding to other countries in early 2015.<ref>{{cite web | url=http://www.wpcentral.com/windows-phone-81-features | title=Windows Phone 8.1 features | work=WPCentral | date=February 17, 2014 | access-date=March 29, 2014}}</ref>

===Windows 10 Mobile===
[[File:Windows 10 Logo.svg|thumb|right|200px|Logo used for Windows 10 and Windows 10 Mobile]]
{{main|Windows 10 Mobile}}

Windows 10 Mobile was announced on January 21, 2015, as a mobile operating system for smartphones and tablets running on ARM architecture. Its primary focus is unification with [[Windows 10]], its PC counterpart, in software and services; in accordance with this strategy, the Windows Phone name has been phased out in favor of branding the platform as an [[Windows 10 editions|edition]] of Windows 10,<ref name=gsmarena-win10>{{cite web|title=Windows Phone 10 to be called just Windows 10|url=http://www.gsmarena.com/windows_mobile_10_or_just_windows_10-news-10836.php|website=GSMArena|access-date=21 January 2015}}</ref><ref name=verge-10phonedebut>{{cite web|last1=Savov|first1=Vlad|title=Windows 10 makes its phone debut|url=https://www.theverge.com/2015/1/21/7865923/microsoft-windows-10-mobile-os|website=The Verge|date=January 21, 2015|publisher=Vox Media|access-date=21 January 2015}}</ref><ref name=techradar-justdied>{{cite web|title=Windows Phone just died|url=http://www.techradar.com/us/news/phone-and-communications/mobile-phones/windows-phone-just-died-1281562|website=Techradar|publisher=Future PLC|access-date=21 January 2015|archive-date=January 22, 2015|archive-url=https://web.archive.org/web/20150122071015/http://www.techradar.com/us/news/phone-and-communications/mobile-phones/windows-phone-just-died-1281562|url-status=dead}}</ref><ref name=techradar-win10phones>{{cite web|title=Windows 10 for mobile detailed with PC syncing, better voice commands|url=http://www.techradar.com/news/phone-and-communications/mobile-phones/windows-10-for-phones-detailed-including-better-voice-commands-1281560|website=Techradar|date=January 21, 2015|publisher=Future PLC|access-date=21 January 2015}}</ref> although it is still a continuation of Windows Phone, and most Windows Phone 8.1 devices can be upgraded to the platform.<ref name=ars-firstlookwp10>{{cite web|title=Our first look at Windows 10 on phones, and Universal Apps for touchscreens|url=https://arstechnica.com/gadgets/2015/01/our-first-look-at-windows-10-on-phones-and-universal-apps-for-touchscreens|website=Ars Technica|author=Andrew Cunningham|date=January 21, 2015|access-date=23 January 2015}}</ref><ref name=pcw-wp10upgrade>{{cite web|title=Microsoft reneges on Windows 10 upgrades for all current Lumia phones|url=http://www.pcworld.com/article/2874481/microsoft-reneges-on-windows-10-upgrades-for-all-current-lumia-phones.html|website=PC World|publisher=IDG|access-date=23 January 2015}}</ref><ref name="seatimes-windows10">{{cite web|title=Microsoft reveals Windows 10|url=http://blogs.seattletimes.com/brierdudley/2014/09/29/microsoft-previews-windows-9/|website=Seattle Times|access-date=September 30, 2014|archive-date=September 30, 2014|archive-url=https://web.archive.org/web/20140930232105/http://blogs.seattletimes.com/brierdudley/2014/09/29/microsoft-previews-windows-9/|url-status=dead}}</ref>

Windows 10 Mobile emphasized software using the Universal Windows Platform (UWP), which allowed apps to be designed for use across multiple Windows 10-based product families with nearly identical code, functionality, and adaptations for available input methods.<ref name=verge-universalpreview>{{cite web|title=Microsoft previews universal apps for Windows 10 PCs, tablets, and phones|url=https://www.theverge.com/2015/1/21/7866941/windows-previews-universal-apps-for-windows-10-pcs-tablets-and-phones|website=The Verge|date=January 21, 2015|access-date=February 7, 2015}}</ref><ref name=pcw-touchfriendlyoffice>{{cite web|title=Microsoft's touch-friendly Office apps now available to download for Windows 10|url=http://www.pcworld.com/article/2879587/microsofts-touch-friendly-office-apps-now-available-to-download-for-windows-10.html|website=PC World|publisher=IDG|access-date=February 6, 2015}}</ref><ref name=office-2016announce>{{cite web|title=The next chapter of Office on Windows|url=http://blogs.office.com/2015/02/04/next-chapter-office-windows/|website=Office Blog|date=February 4, 2015|publisher=Microsoft|access-date=February 6, 2015|archive-date=February 6, 2015|archive-url=https://web.archive.org/web/20150206002844/http://blogs.office.com/2015/02/04/next-chapter-office-windows/|url-status=dead}}</ref> When connected to an external display, devices could also render a stripped-down desktop interface similar to Windows on PCs, with support for keyboard and mouse input.<ref name=witpro-continumwm10>{{cite web|title=A PC in Your Pocket: Continuum for Windows Phones|url=http://windowsitpro.com/windows-10/pc-your-pocket-continuum-windows-phones|website=Windows IT Pro|publisher=Penton|access-date=May 16, 2015|archive-url=https://web.archive.org/web/20150518092722/http://windowsitpro.com/windows-10/pc-your-pocket-continuum-windows-phones|archive-date=May 18, 2015|url-status=dead}}</ref><ref name=w10-phonedesktop-verge>{{cite web|title=Your Windows 10 phone can turn into a full PC|url=https://www.theverge.com/2015/4/29/8513519/microsoft-windows-10-continuum-for-phones|website=The Verge|date=April 29, 2015|access-date=April 29, 2015}}</ref> Windows 10 Mobile featured [[Skype]] message integration, updated Office Mobile apps, notification syncing with other Windows 10 devices, support for the [[Microsoft Edge]] web browser, and other user interface improvements.<ref name=verge-10phonedebut/><ref name=verge-thisiswp10>{{cite web|title=This is Windows 10 for phones|url=https://www.theverge.com/2015/1/21/7869441/windows-10-for-phones-features-hands-on|website=The Verge|date=January 21, 2015|publisher=Vox Media|access-date=January 22, 2015}}</ref><ref name=ieblog-spartan>{{cite web|title=Project Spartan and the Windows 10 January Preview Build|url=http://blogs.msdn.com/b/ie/archive/2015/01/22/project-spartan-and-the-windows-10-january-preview-build.aspx|website=IEBlog|publisher=Microsoft|access-date=January 23, 2015}}</ref> Microsoft developed a [[middleware]] known as Windows Bridge to allow [[iOS]] [[Objective-C]] and [[Android (operating system)|Android]] [[C++]] or [[Java programming language|Java]] software to be ported to run on Windows 10 Mobile with limited changes to code.<ref name=trpro-wp10android>{{cite web|title=How will Android support work in Windows 10 for Phones?|url=http://www.techradar.com/us/news/software/applications/how-will-android-support-work-in-windows-10-mobile--1293295|website=TechRadar Pro|access-date=May 22, 2015|archive-url=https://web.archive.org/web/20150519175925/http://www.techradar.com/us/news/software/applications/how-will-android-support-work-in-windows-10-mobile--1293295|archive-date=May 19, 2015|url-status=dead|df=mdy-all}}</ref><ref name=ars-w10androidiosapps>{{cite web|title=Microsoft brings Android, iOS apps to Windows 10|url=https://arstechnica.com/information-technology/2015/04/29/microsoft-brings-android-ios-apps-to-windows-10/|website=Ars Technica|date=April 29, 2015|access-date=April 30, 2015}}</ref><ref name=pcw-windowsbridge>{{cite web|title=Microsoft releases iOS-to-Windows app maker Windows Bridge to open source|url=http://www.pcworld.com/article/2960526/software-development/microsoft-releases-ios-to-windows-app-maker-windows-bridge-to-open-source.html|website=PC World|publisher=IDG|access-date=6 August 2015}}</ref>

With the diminishing interest and application development for the platform, Microsoft discontinued active development of Windows 10 Mobile in 2017,<ref name="cnet-winmobile-byebye">{{Cite web|url=https://www.cnet.com/news/windows-10-mobile-features-hardware-death-sentence-microsoft/|title=Goodbye, Windows 10 Mobile, tweets Joe Belfiore|last=Reilly|first=Claire|website=CNET|language=en|access-date=2020-02-28}}</ref> and the platform was declared [[End-of-life (product)|end of life]] on January 14, 2020.<ref>{{Cite web|url=https://www.extremetech.com/mobile/303590-microsoft-delays-windows-10-mobiles-death-by-one-month|title=Microsoft Delays Windows 10 Mobile's Death by One Month|website=ExtremeTech|date=December 18, 2019 |access-date=2019-12-18}}</ref><ref>{{Cite web|url=https://www.zdnet.com/article/microsoft-gives-windows-10-mobile-a-little-extra-time-before-the-end/|title=Microsoft gives Windows 10 Mobile a little extra time before the end|last=Tung|first=Liam|website=ZDNet|language=en|access-date=2019-12-18}}</ref>

==Features==

===User interface===
Windows Phone features a [[user interface]] based on Microsoft's "[[Metro Design Language|Metro]]" [[design language]],<ref>{{cite web |title= Windows Phone Design System - Codename Metro |website=[[Microsoft]] |url= http://download.microsoft.com/download/F/F/C/FFCF79B1-C2EB-42C2-8E2D-665705380DA0/Windows%20Phone%20Design%20System%20-%20Codename%20Metro.PDF|url-status=dead|archive-url=https://web.archive.org/web/20101115052944/http://download.microsoft.com/download/F/F/C/FFCF79B1-C2EB-42C2-8E2D-665705380DA0/Windows%20Phone%20Design%20System%20-%20Codename%20Metro.PDF|archive-date=November 15, 2010}}</ref> and was inspired by the user interface in the [[Zune HD]].<ref>{{cite web|last=Melanson |first=Donald |url=https://www.engadget.com/2010/02/06/rumored-windows-phone-7-details-surface-ahead-of-mwc-launch-zun/ |title=Rumored Windows Phone 7 details surface ahead of MWC launch: Zune-like UI, no multitasking |work=[[Engadget]]|publisher=[[AOL]] |date=2010-02-06 |access-date=2013-06-14}}</ref> The home screen, called the "Start screen", is made up of "Live Tiles", which have been the inspiration for the [[Windows 8]] live tiles. Tiles are links to applications, features, functions and individual items (such as contacts, web pages, applications or media items). Users can add, rearrange, or remove tiles.<ref>{{cite web |url= https://www.engadget.com/2010/02/15/windows-phone-7-series-is-official-and-microsoft-is-playing-to/ |title= Windows Phone 7 Series is official, and Microsoft is playing to win |first= Joshua |last= Topolsky |author-link= Joshua Topolsky |work= [[Engadget]] |publisher= [[AOL]] |date= February 15, 2010 |access-date= February 15, 2010}}</ref> Tiles are dynamic and update in real time – for example, the tile for an email account would display the number of unread messages or a tile could display a live update of the weather.<ref name="ReferenceA">{{cite web |url= https://www.engadget.com/2010/03/18/windows-phone-7-series-the-complete-guide/ |first= Chris |last= Ziegler |work= [[Engadget]] |publisher= [[AOL]] |title= Windows Phone 7: the complete guide |date= March 18, 2010 |access-date= September 19, 2010}}</ref> Since [[Windows Phone 8]], live tiles can also be resized to either a small, medium, or large appearance.

Several features of Windows Phone are organized into "'''hubs'''", which combine local and online content via Windows Phone's integration with popular [[Social network service|social networks]] such as [[Facebook]], [[Windows Live]], and [[Twitter]].<ref name="ReferenceA"/> For example, the Pictures hub shows photos captured with the device's camera and the user's Facebook photo albums, and the People hub shows contacts aggregated from multiple sources including Windows Live, Facebook, and [[Gmail]]. From the hub, users can directly comment and 'like' on social network updates. The other built-in hubs are Xbox Music and Video, Xbox Live Games, [[Windows Phone Store]], and [[Microsoft Office Mobile|Microsoft Office]].<ref name="ReferenceA"/>

Windows Phone uses [[multi-touch]] technology.<ref name="ReferenceA"/> The default Windows Phone user interface has a dark theme that prolongs battery life on [[OLED|OLED screens]] as fully black pixels do not emit light. Alternatively, users may choose a light theme in their phone's settings menu.<ref>{{cite web |url= http://www.neowin.net/news/interview-windows-phone-7-battery-life-copypaste-multitasking-and-more |title= Interview: Windows Phone 7 battery life, copy/paste, multitasking, and more |last= Rubenstein |first= Benjamin |work= [[Neowin]] |date= March 17, 2010 |access-date= August 21, 2010}}</ref> The user may also choose from several accent colors.<ref>{{cite video |first= Greg |last= Sullivan |date= July 27, 2010 |title= The Most Comprehensive Windows Phone 7 Demo to Date |url= http://pocketnow.com/windows-phone/comprehensive-windows-phone-7-demo |access-date= September 19, 2010 |archive-date= May 14, 2011 |archive-url= https://web.archive.org/web/20110514174848/http://pocketnow.com/windows-phone/comprehensive-windows-phone-7-demo |url-status= dead }}</ref> User interface elements such as links, buttons and tiles are shown in the user's chosen accent color. [[Third-party software component|Third-party applications]] can be automatically themed with these colors.<ref>{{cite video |first1= Laura |last1= Foy |first2= Sean |last2= Mckenna |date= August 4, 2010 |title= Windows Phone 7: Applications & Tools |url= http://channel9.msdn.com/blogs/laurafoy/windows-phone-7-apps--tools |publisher= [[Microsoft]] |work=[[Channel 9 (Microsoft)|Channel9]]|access-date= September 19, 2010}}</ref> [[Windows Phone 8.1]] introduces transparent tiles and a customizable background image for the Start screen. The image is visible through the transparent area of the tiles and features a [[parallax scrolling|parallax]] effect when scrolling which gives an illusion of depth. If the user does not pick a background image the tiles render with the accent color of the theme.

===Text input===
Users input text by using an on-screen [[virtual keyboard]], which has a dedicated key for inserting [[emoticons]],<ref name="windows phone preview">{{cite web |url= https://www.engadget.com/2010/07/19/windows-phone-7-in-depth-preview/ |title= Windows Phone 7 in-depth preview |first= Joshua |last= Topolsky |author-link= Joshua Topolsky |work= [[Engadget]] |publisher= [[AOL]] |date= July 19, 2010 |access-date= September 4, 2010}}</ref> and features spell checking<ref name="windows phone preview"/> and word prediction.<ref>{{cite web |url= http://rgullhaug.wordpress.com/2010/09/08/autocompletebox-in-wp7 |first= Roger |last= Gullhaug |work= Roger Gullhaug's Blog |title= AutoCompleteBox in Windows Phone 7 |date= September 8, 2010 |access-date= September 21, 2010}}</ref> App developers (both inhouse and ISV) may specify different versions of the virtual keyboard in order to limit users to certain character sets, such as numeric characters alone. Users may change a word after it has been typed by tapping the word,<ref>{{cite web |url= http://pocketnow.com/windows-phone/windows-phone-7-keyboard-demoed-deemed-fast-responsive-accurate |first= Chuong |last= Nguyen |work= Pocketnow |title= Windows Phone 7 Keyboard Demoed, Deemed Fast, Responsive, Accurate |date= August 10, 2010 |access-date= September 19, 2010 |archive-date= August 22, 2010 |archive-url= https://web.archive.org/web/20100822052336/http://pocketnow.com/windows-phone/windows-phone-7-keyboard-demoed-deemed-fast-responsive-accurate |url-status= dead }}</ref> which will invoke a list of similar words. Pressing and holding certain keys will reveal similar characters. The keys are somewhat larger and spaced farther apart when in landscape mode. Phones may also be made with a hardware keyboard for text input.<ref>{{cite web |url= http://pocketnow.com/deals/windows-phone-7-series-text-entry-strict-hardware-requirements |first= Brandon |last= Miniman |work= Pocketnow |title= Windows Phone 7 Series Text Entry: Strict Hardware Requirements |date= August 17, 2010 |access-date= September 19, 2010 |archive-date= March 22, 2010 |archive-url= https://web.archive.org/web/20100322201900/http://pocketnow.com/deals/windows-phone-7-series-text-entry-strict-hardware-requirements |url-status= dead }}</ref> Users can also add accents to letters by holding on an individual letter. [[Windows Phone 8.1]] introduces a new method of typing by swiping through the keyboard without lifting the finger, in a manner similar to [[Swype]] and [[SwiftKey]].

===Web browser===
{{See also|Internet Explorer Mobile}}

Internet Explorer on Windows Phone allows the user to maintain a list of favorite web pages and tiles linking to web pages on the Start screen. The browser supports up to 6 tabs, which can all load in parallel.<ref>{{cite video |first= Brandon |last= Miniman |date= August 23, 2010 |title= Exclusive: Windows Phone 7 Web Browser Comparison |url= http://pocketnow.com/windows-phone/exclusive-windows-phone-7-web-browser-comparison |publisher= Pocketnow |access-date= October 27, 2011 |time= 1:21 |archive-date= November 26, 2011 |archive-url= https://web.archive.org/web/20111126190449/http://pocketnow.com/windows-phone/exclusive-windows-phone-7-web-browser-comparison |url-status= dead }}</ref> Other features include multi-touch gestures, smooth zoom in/out animations, the ability to save pictures that are on web pages, share web pages via email, and support for inline search which allows the user to search for a word or phrase in a web page by typing it.<ref>{{cite video |url= http://pocketnow.com/software-1/first-look-internet-explorer-on-windows-phone-7-series |first= Brandon |last= Miniman |title= First Look: Internet Explorer on Windows Phone 7 Series |publisher= Pocketnow |date= March 15, 2010 |access-date= September 19, 2010 |archive-date= January 1, 2011 |archive-url= https://web.archive.org/web/20110101150935/http://pocketnow.com/software-1/first-look-internet-explorer-on-windows-phone-7-series |url-status= dead }}</ref> Tabs are synced with [[Windows 8.1]] devices using [[Internet Explorer 11]].

===Contacts===
Contacts are organized via the "'''People hub'''", and can be manually entered into contacts or imported from [[Facebook]], [[Windows Live Contacts]], [[Twitter]], [[LinkedIn]], [[Google]], and [[Microsoft Outlook|Outlook]]. A "What's New" section shows a user's Facebook news feed and a "Pictures" section show pictures from those social networks, while a "Me" section within the "People" hub shows a user's own social network status and wall and allows them to view social network updates. Contacts can also be pinned to the Start Screen. The contact's "'''Live Tile'''" displays their social network status and profile picture on the homescreen. Clicking on a contact's tile or accessing their card within the "People" hub will reveal their recent social network activity as well as the rest of their contact information.

If a contact has information stored on multiple networks, users can link the two separate contact accounts, allowing the information to be viewed and accessed from a single card.<ref>{{cite web|title= Linking two or more contacts|url= http://www.microsoft.com/windowsphone/en-us/howto/wp7/people/link-two-or-more-contacts.aspx|publisher= [[Microsoft]]|access-date= September 6, 2011|archive-url= https://web.archive.org/web/20110906194644/http://www.microsoft.com/windowsphone/en-us/howto/wp7/people/link-two-or-more-contacts.aspx|archive-date= September 6, 2011|url-status= dead|df= mdy-all}}</ref> As of Windows Phone 7.5, contacts can also be sorted into "Groups". Here, information from each of the contacts is combined into a single page which can be accessed directly from the Hub or pinned to the Start screen.

=== Email ===
{{Main|Mail (Windows)}}
Windows Phone supports [[Outlook.com]], [[Microsoft Exchange Server|Exchange]], [[Yahoo! Mail]] and [[Gmail]] natively and supports many other services via the [[Post Office Protocol|POP]] and [[Internet Message Access Protocol|IMAP]] protocols. Updates added support for more services such as [[iCloud]] and [[IBM Notes Traveler]]. Contacts and calendars may be synced from these services as well. Users can also search through their email by searching in the subject, body, senders, and receivers. Emails are shown with threads, and multiple email inboxes can be combined into a single view (a feature commonly referred to as "combined inbox") or can viewed separately.

===Multimedia===
[[File:WPZuneHub.jpg|thumb|upright|The Music + Video Hub on Windows Phone]]
{{See also|Xbox Music|Xbox Video}}
'''Xbox Music''' and '''Xbox Video''' are built-in multimedia hubs providing entertainment and synchronization capabilities between PC, Windows Phone, and other Microsoft products.<ref>{{Cite web|url=https://www.xbox.com/en-US/entertainment|title=Xbox Entertainment &#124; Xbox|website=Xbox.com}}</ref> The two hubs were previously combined until standalone apps were released in late 2013, shortly before [[Windows Phone 8.1]] debuted.<ref name="theverge1">{{cite web | last=Warren | first=Tom | title=Xbox Video app finally arrives on Windows Phone | website=The Verge | date=2013-12-18 | url=https://www.theverge.com/2013/12/18/5223842/xbox-video-windows-phone-app-download | access-date=2019-11-04}}</ref> The hubs allow users to access music, videos, and podcasts stored on the device, and links directly to the "Xbox Music Store" to buy or rent music and the "Xbox Video Store" to purchase movies and TV episodes. Xbox Music also allows the user to stream music with an Xbox Music Pass. When browsing the music by a particular artist, users are able to view artist biographies and photos.<ref name="windows phone preview" /> The Xbox Music hub also integrates with many other apps that provide video and music services, including, but not limited to, [[iHeartRadio]], YouTube, and [[Vevo]]. This hub also includes Smart DJ which compiles a playlist of songs stored on the phone similar to the song or artist selected.

The '''Pictures hub''' displays the user's Facebook and [[OneDrive]] photo albums, as well as photos taken with the phone's built-in camera. Users can also upload photos to social networks, comment on photos uploaded by other people, and tag photos posted to social networks.<ref name="windows phone preview" /> Multi-touch gestures permit zooming in and out of photos.

An official file manager app called '''Files''', which is available for download from the Windows Phone Store, enables users to move and rearrange documents, videos, music and other files within their device's hard drive or to an external SD card.<ref>{{cite web|url=http://www.windowsphone.com/en-in/store/app/files/762e837f-461d-4847-8399-3526f54fc25e|title=Get Files - Microsoft Store|website=Microsoft Store}}</ref>

====Media support====
Windows Phone supports WAV, MP3, WMA, AMR, [[Advanced Audio Coding|AAC/MP4/M4A/M4B]] and [[3GP and 3G2|3GP/3G2]] standards. The video file formats supported on WP include WMV, AVI, MP4/M4V, 3GP/3G2 and [[.mov|MOV (QuickTime)]] standards.<ref>{{cite web |url= http://pocketnow.com/windows-phone/windows-phone-7-which-video-and-audio-file-formats-are-supported |title= Windows Phone 7: Which Video and Audio File Formats are Supported? |work= Pocketnow |date= September 21, 2010 |first= Brandon |last= Miniman |access-date= August 6, 2011 |archive-date= August 17, 2011 |archive-url= https://web.archive.org/web/20110817051050/http://pocketnow.com/windows-phone/windows-phone-7-which-video-and-audio-file-formats-are-supported |url-status= dead }}</ref> These supported audio and video formats would be dependent on the codecs contained inside them. It has also been previously reported that the [[DivX]] and [[Xvid]] codecs within the AVI file format are also playable on WP devices.<ref>{{cite web |url= http://wmpoweruser.com/updates-codec-support-list-for-windows-phone-7-released-xvid-and-divx-supported/ |title= Updates codec support list for Windows Phone 7 released, XVID and DIVX supported |work= WMPoweruser.com |date= September 18, 2010 |access-date= August 6, 2011 |archive-date= June 28, 2014 |archive-url= https://web.archive.org/web/20140628162132/http://wmpoweruser.com/updates-codec-support-list-for-windows-phone-7-released-xvid-and-divx-supported/ |url-status= dead }}</ref><ref>{{cite web |url= http://answers.microsoft.com/en-us/winphone/forum/wp7-wpdevices/avidivx-support/4966f233-bf3a-4495-87f4-ad130e6539ea |title= AVI/DivX support |publisher= [[Microsoft]] |date= October 21, 2010 |work= Microsoft Answers |access-date= August 6, 2011}}</ref>

Windows Phone does not support DRM protected media files that are obtained from services other than Xbox Music Pass.<ref>{{cite web|title=Sync music, ringtones, and podcasts using my computer|url=https://www.windowsphone.com/en-us/how-to/wp8/music-and-videos/sync-music-ringtones-and-podcasts-using-my-computer|access-date=2 January 2015}}</ref>

The image file formats that are supported include [[JPEG|JPG/JPEG]], PNG, GIF, TIF and Bitmap (BMP).<ref>{{cite web |url= http://msdn.microsoft.com/en-us/library/ff462087(v=vs.92).aspx
|title= Supported Media Codecs for Windows Phone |publisher= Microsoft |work= Microsoft Developer Network (MSDN) |access-date= August 6, 2011}}</ref><ref>{{cite web |url= http://support.microsoft.com/kb/928191 |title= Audio file formats supported by the Zune software |publisher= [[Microsoft]] |date= October 12, 2010 |work= Microsoft Support |access-date= August 6, 2011}}</ref>

Users can also add custom ringtones which are less than 1MB in size and less than 40 seconds long. DLNA streaming and stereoscopic 3D are also supported.<ref name="theverge1"/>

===Games===
{{Main|List of Xbox Live games on Windows Phone}}
{{See also|Xbox Live}}
The "'''Games hub'''" provides access to [[video game|games]] on a phone along with [[Xbox Live]] functionality, including the ability for a user to interact with their [[Avatar (Xbox 360)|avatar]], view and edit their profile, see their achievements and view leaderboards, and send messages to friends on Xbox Live. The hub also features an area for managing invitations and turn notifications in turn-based multiplayer games.<ref>{{cite web |url= http://www.microsoft.com/windowsphone/en-us/howto/wp7/apps/games-hub.aspx |title= Games Hub for Windows Phone 7 |publisher= [[Microsoft]] |access-date= July 24, 2012}}</ref> Games are downloaded from [[Windows Phone Store]].

===Search===
{{See also|Bing (search engine)|Bing Mobile|Bing Maps}}

Bing is the default [[Web search engine|search engine]] on Windows Phone handsets because its functions are deeply integrated in the OS (which also include the utilization of its [[Bing Maps|map service]] for location-based searches and queries). However, Microsoft has stated that other search engine applications can be used.<ref name="MaryJo_Will">{{cite web |url= http://www.zdnet.com/blog/microsoft/will-all-xbox-games-work-on-windows-phone-7-devices/5272 |archive-url= https://web.archive.org/web/20100519113116/http://www.zdnet.com/blog/microsoft/will-all-xbox-games-work-on-windows-phone-7-devices/5272 |url-status= dead |archive-date= May 19, 2010 |title= Will all Xbox games work on Windows Phone 7 devices? |first= Mary Jo |last= Foley |date= February 15, 2010 |work=[[ZDNet]] |publisher= [[CBS Interactive]] |access-date= July 24, 2012}}</ref><ref name="Lint_default">{{cite web |url= http://www.pocket-lint.com/news/34446/bing-only-default-search-option |title= Windows Phone 7: Bing only default search option |date= July 21, 2010 |work= Pocket-lint |first= Stuart |last= Miles |access-date= July 24, 2012}}</ref>

In the area of location-based searches, Bing Maps (which is powered by Nokia's location services) provides [[turn-by-turn navigation]] service to Windows Phone users, and Local Scout shows interest points such as attractions and restaurants in the nearby area. On Nokia devices, Nokia's [[Here Maps]] is preinstalled in place of Bing Maps.

Furthermore, [[Bing Audio]] allows the user to match a song with its name, and [[Bing Vision]] allows the user to scan barcodes, QR codes, and other types of tags.

====Cortana====
<!-- Commented out: [[File:Cortana WP8.1.png|thumb|150px|upright|Cortana on Windows Phone 8.1]] -->
{{Main|Microsoft Cortana}}
Every Windows Phone has either a dedicated physical Search button or an on-screen Search button, which was previously reserved for a Bing Search app, but has been replaced on [[Windows Phone 8.1]] devices and later in the United Kingdom and United States by [[Microsoft Cortana|Cortana]], a digital personal assistant which can also double as an app for basic searches.

Cortana allows users to do tasks such as set calendar reminders and alarms, and recognizes a user's natural voice, and can be used to answer questions (like current weather conditions, sports scores, and biographies). The app also keeps a "Notebook" to learn a user's behavior over time and tailor reminders for them. Users can edit the "Notebook" to keep information from Cortana or reveal more about themselves.

===Office suite===

{{See also|Microsoft Office Mobile}}
All Windows Phones come preinstalled with Microsoft Office Mobile, which provides interoperability between Windows Phone and the desktop version of [[Microsoft Office]]. Word Mobile, Excel Mobile, PowerPoint Mobile, and SharePoint Workspace Mobile apps are accessible through a single "Office Hub", and allow most Microsoft Office file formats to be viewed and edited directly on a Windows Phone device. The "Office Hub" can access files from OneDrive and [[Office 365]], as well as files which are stored locally on the device's hard drive. Although they are not preinstalled in Windows Phone's "Office Hub", OneNote Mobile, Lync Mobile, and OneDrive for Business can be downloaded separately as standalone applications from the Windows Phone Store.

===Multitasking===
Multitasking in Windows Phone is invoked through long pressing the "back" arrow, which is present on all Windows Phones. Windows Phone 7 uses a card-based task switcher, whereas later versions of Windows Phone utilize true background multitasking.

===Sync===

====Windows Phone 7====
{{Main|Windows Phone 7#Sync}} {{See also|Zune Software}}
Zune Software manages the contents on Windows Phone 7 devices and Windows Phone can wirelessly sync with Zune Software.

====Later versions====
{{Main|Windows Phone 8#Syncing}}
Syncing content between Windows Phone 8 and 8.1 and Windows PCs or Macs is provided through the [[Windows Phone App]], which is available for both [[Windows]] and [[Mac OS X]]. It is the official successor to Zune software only for Windows Phone 8 and Windows Phone 8.1, and allows users to transfer content such as music, videos, and documents.

Users also have the ability to use a "Tap and Send" feature that allows for file transfer between Windows phones, and NFC-compatible devices through [[Near field communication|NFC]].

===Updates===
[[File:WinPhoneUpdate.jpg|thumb|upright|A test notification of an "update available" pop-up in the Windows Phone emulator]]
Software updates are delivered to Windows Phone users via Microsoft Update, as is the case with other Windows operating systems.<ref>{{cite web |url= http://windowsphonesecrets.com/2010/04/19/windows-phone-os-7-0-architecture-guide/ |title= Windows Phone OS 7.0 Architecture Guide |first= Paul |last= Thurrott |author-link= Paul Thurrott |work= Windows Phone Secrets |date= April 19, 2010 |access-date= September 9, 2010}}</ref> Microsoft initially had the intention to directly update any phone running Windows Phone instead of relying on [[OEM]]s or [[wireless carrier]]s,<ref>{{cite web |url= http://www.mobiletechworld.com/2010/04/11/microsoft-talks-windows-phone-7-features-native-code-multi-tasking-and-update-process |title= Microsoft talks Windows Phone 7 features, native code, multi-tasking and update process |first= M. |last= Daou |work= MobileTechWorld |date= April 11, 2012 |access-date= July 24, 2012 |archive-url= https://web.archive.org/web/20120510210727/http://www.mobiletechworld.com/2010/04/11/microsoft-talks-windows-phone-7-features-native-code-multi-tasking-and-update-process/ |archive-date= May 10, 2012 |url-status= dead }}</ref> but on January 6, 2012, Microsoft changed their policy to let carriers decide if an update will be delivered.<ref>{{cite web |url= http://windowsteamblog.com/windows_phone/b/windowsphone/archive/2012/01/06/new-maintenance-release-for-windows-phone.aspx |title= New maintenance release for Windows Phone |first= Eric |last= Hautala |work= Windows Phone Blog |publisher= [[Microsoft]] |date= January 6, 2012 |access-date= July 24, 2012}}</ref>

While Windows Phone 7 users were required to attach their phones to a PC to install updates,<ref>{{cite web |url= http://www.mobiletechworld.com/2010/05/16/confidential-windows-phone-7-development-guides-leaked/ |title= Confidential Windows Phone 7 Development Guides leaked |work= MobileTechWorld |first= M. |last= Daou |date= May 16, 2010 |access-date= June 3, 2010 |archive-url= https://web.archive.org/web/20100521194608/http://www.mobiletechworld.com/2010/05/16/confidential-windows-phone-7-development-guides-leaked/ |archive-date= May 21, 2010 |url-status= dead }}</ref> starting with Windows Phone 8, all updates are done via over-the-air downloads.<ref>{{cite web |url= http://www.windowsphonethoughts.com/news/show/100826/windows-update-for-windows-phone-this-is-what-you-ve-been-waiting-for.html |title= Windows Update for Windows Phone: This is What You've Been Waiting For |work= Windows Phone Thoughts |publisher= Thoughts Media |first= Jason |last= Dunn |date= October 20, 2010 |access-date= July 24, 2012}}</ref> Since Windows Phone 8, Microsoft has also begun releasing minor updates that add features to a current OS release throughout the year.<ref>{{cite web |url= http://news.cnet.com/8301-13860_3-20019259-56.html?tag=cnetRiver |title= Ballmer talks Windows Phone 7 with CNET (Q&A)|first= Ina |last= Fried |work= [[CNET]] |publisher= [[CBS Interactive]] |date= October 11, 2010 |access-date= July 24, 2012}}</ref> These updates were first labeled "General Distribution releases" (GDRs), but were later rebranded simply as "Updates".

All third-party applications can be updated automatically from the [[Windows Phone Store]].<ref>{{cite web |url= https://www.engadget.com/2010/03/15/windows-phone-marketplace-for-windows-phone-7-series-unveiled/ |title= Windows Phone Marketplace for Windows Phone 7 Series unveiled |work= [[Engadget]] |publisher= [[AOL]] |first= Chris |last= Ziegler |date= March 15, 2010 |access-date= June 3, 2010}}</ref>

===Advertising platform===
Microsoft has also launched an advertising platform for the Windows Phone platform. Microsoft's General Manager for Strategy and Business Development, Kostas Mallios, said that Windows Phone will be an "ad-serving machine", pushing advertising and brand-related content to the user. The platform will feature advertising tiles near applications and [[Toast (computing)|toast notifications]], which will bring updating advertising notifications. Mallios said that Windows Phone will be able to "preserve the brand experience by going directly from the web site right to the application", and that Windows Phone "enables advertisers to connect with consumers over time".<ref name="Newsfactor_Ads">{{cite web |url= http://www.newsfactor.com/news/Phone-7-Seen-as--Ad-Serving-Machine-/story.xhtml?story_id=12100BWDYBSP&full_skip=1 |title= MS Sees Windows Phone 7 as an 'Ad-Serving Machine' |date= June 25, 2010 |first= Barry |last= Levine |work= NewsFactor |access-date= July 25, 2012 |archive-url= https://web.archive.org/web/20120725200710/http://www.newsfactor.com/news/Phone-7-Seen-as--Ad-Serving-Machine-/story.xhtml?story_id=12100BWDYBSP&full_skip=1 |archive-date= July 25, 2012 |url-status= dead |df= mdy-all }}</ref> Mallios continued: "you're now able to push information as an advertiser, and stay in touch with your customer. It's a dynamic relationship that is created and provides for an ongoing dialog with the consumer."<ref name="Informationweek_Ads">{{cite web |url= http://www.informationweek.com/news/windows/microsoft_news/229202367 |archive-url= https://archive.today/20130126060608/http://www.informationweek.com/news/windows/microsoft_news/229202367 |url-status= dead |archive-date= January 26, 2013 |title= Microsoft's Ad-Serving Machine |first= Dave |last= Methvin |date= June 25, 2010 |work= [[InformationWeek]] |publisher= UBM TechWeb |access-date= July 25, 2012 }}</ref>

===Bluetooth===
Windows Phone supports the following [[Bluetooth profile]]s:<ref>{{cite web |url= http://support.microsoft.com/kb/2449475 |title= Bluetooth profiles supported by Windows Phone |work = Microsoft Support |publisher= [[Microsoft]] |date= February 13, 2012 |access-date= March 14, 2012}}</ref>

# Advanced Audio Distribution Profile (A2DP 1.2)
# Audio/Video Remote Control Profile (AVRCP 1.3)
# Hands Free Profile (HFP 1.5)
# Headset Profile (HSP 1.1)
# Phone Book Access Profile (PBAP 1.1)
# Bluetooth File Transfer ([[OBEX]]) (from Windows Phone 7.8)

Windows Phone BTF support is available from Windows Phone 7.8, but is limited to the transferring of pictures, music and videos via a 'Bluetooth Share' app.<ref>{{cite web |url= http://answers.microsoft.com/en-us/winphone/forum/wp7-wppics/can-i-send-or-receive-files-through-bluetooth-on/aa9a37b4-d075-44a2-8f21-e5758d839e97 |title= Can i send or receive files through bluetooth on windows phone 7.5 mango? |work= Microsoft Answers |publisher= [[Microsoft]] |date= October 4, 2011 |access-date= July 25, 2012}}</ref><ref>{{cite web |url= http://answers.microsoft.com/en-us/winphone/forum/wp7-wpdevices/send-photos-docs-via-bluetooth/0517b1a7-ed0c-4d9a-ba39-355e0ae2e422 |title= Send photos, Docs via Bluetooth |work= Microsoft Answers |publisher= [[Microsoft]] |date= October 28, 2012 |access-date= July 25, 2012}}</ref>

===Feature additions===
Microsoft kept a site where people can submit and vote on features they would like to see added to Windows Phone.<ref>{{cite web |url=http://blogs.windows.com/bloggingwindows/2011/09/28/have-a-new-windows-phone-feature-idea-try-suggestion-box/ |title=Have a new Windows Phone feature idea? Try Suggestion Box |publisher=Windowsteamblog.com |date=September 28, 2011|access-date=2013-12-16}}</ref>

==Store==
{{Main|Windows Phone Store|Xbox Music|Xbox Video}}
The [[Windows Phone Store]] was used to digitally distribute music, video content, [[podcasts]], and third-party applications to Windows Phone handsets. The store was accessible using the [[Zune Software]] client or the Windows Phone Store hub on devices (though videos were not downloadable through the store hub and must be downloaded and synced through the Zune software).<ref>{{cite web |url=http://www.microsoft.com/windowsphone/en-us/howto/wp7/music/get-music-videos-and-podcasts-from-marketplace.aspx |title=Get music, videos, and podcasts from Marketplace |publisher=[[Microsoft]] |access-date=August 17, 2012}}</ref> The Store was managed by [[Microsoft]], which included an approval process. As of March 2012, the Windows Phone Store was available in 54 countries.<ref>{{cite web |url=http://windowsteamblog.com/windows_phone/b/windowsphone/archive/2012/03/28/marketplace-arrives-in-13-new-countries.aspx |archive-url=https://web.archive.org/web/20120329044442/http://windowsteamblog.com/windows_phone/b/windowsphone/archive/2012/03/28/marketplace-arrives-in-13-new-countries.aspx |url-status=dead |archive-date=March 29, 2012 |title=Marketplace arrives in 13 new countries |first=Mazhar |last=Mohammed |work=Windows Phone Blog |publisher=[[Microsoft]] |date=March 28, 2012 |access-date=August 17, 2012}}</ref>

===Music and videos===
Xbox Music offered approximately 50 million songs up to 320&nbsp;kbit/s in [[Digital rights management|DRM]]-free MP3 format from the [[World music market|big four music groups]] ([[EMI]], [[Warner Music Group]], [[Sony BMG]] and [[Universal Music Group]]), as well as smaller music labels. Xbox Video offered HD movies from [[Paramount Pictures|Paramount]], [[Universal Pictures|Universal]], [[Warner Brothers]], and other studios and plus television shows from popular television networks.

Microsoft offered the ''Xbox Music Pass'' music subscription service, which allowed subscribers to download an unlimited number of songs for as long as their subscription was active and play them on current Microsoft devices.

===Applications and games===

====Development====
Third-party applications and games for Windows Phone can be based on [[Microsoft XNA|XNA]], a Windows Phone-specific version of [[Silverlight]], the GUI-based Windows Phone App Studio, or the [[Windows Runtime]], which allows developers to develop an app for both the [[Windows Store]] and Windows Phone Store simultaneously.<ref>{{cite web |url=http://msdn.microsoft.com/en-us/library/ff426931(v=VS.95).aspx |title=Features Differences Between Silverlight and Silverlight for Windows Phone |work=[[Microsoft Developer Network|Microsoft Developer Network (MSDN)]] |publisher=[[Microsoft]] |access-date=October 27, 2011}}</ref><ref>{{cite web | title=Leaked images show Universal Store of apps for Windows and Windows Phone | website=OnMSFT.com | date=2014-02-13 | url=https://www.onmsft.com/news/leaked-images-show-universal-store-app-windows-and-windows-phone | access-date=2019-11-04}}</ref><ref>{{cite web | title=Windows Phone App Studio - Microsoft | website=appstudio.windowsphone.com | url=http://appstudio.windowsphone.com/ | archive-url=https://web.archive.org/web/20140301130835/http://appstudio.windowsphone.com/ | archive-date=2014-03-01 | url-status=dead | access-date=2019-11-04}}</ref> App developers can develop apps using [[C Sharp (programming language)|C#]] / [[Visual Basic.NET]] ([[.NET Framework|.NET]]), [[C++/CX|C++ (CX)]] or [[HTML5]]/[[JavaScript]].

For Windows Phone apps to be designed and tested within Visual Studio or Visual Studio Express, Microsoft offers Windows Phone Developer Tools, which run only on [[Windows Vista SP2]] and later, as an extension<ref>{{cite web |url= http://msdn.microsoft.com/en-us/library/ff402530(v=vs.92).aspx#BKMK_SysReqs |title= Installing the Windows Phone SDK |work= Microsoft Developer Network (MSDN) |publisher= Microsoft |date= September 23, 2011 |access-date= October 27, 2011}}</ref> Microsoft also offers [[Expression Blend]] for Windows Phone for free. On November 29, 2009, Microsoft announced the [[Release to web|Release-to-web (RTW)]] version of its [[Visual Basic .NET]] Developer Tool, to aid development of Windows Phone apps in Visual Basic.

Later versions of Windows Phone support the running of [[managed code]] through a [[Common Language Runtime]] similar to that of the [[Microsoft Windows|Windows operating system]] itself, as opposed to the [[.NET Compact Framework]]. This, along with support for native C and C++ libraries, allows some traditional Windows desktop programs to be easily ported to Windows Phone.<ref>{{cite web|url=http://windowsteamblog.com/windows_phone/b/wpdev/archive/2012/06/29/recapping-windows-phone-8-developer-news.aspx |archive-url=https://web.archive.org/web/20120701020033/http://windowsteamblog.com/windows_phone/b/wpdev/archive/2012/06/29/recapping-windows-phone-8-developer-news.aspx |url-status=dead |archive-date=July 1, 2012 |title=Recapping Windows Phone 8 developer news |work=The Windows Phone Developer Blog |first=Kevin |last=Gallo |publisher=[[Microsoft]] |date=June 29, 2012 |access-date=August 17, 2012 }}</ref>

====Submission====
Registered Windows Phone and Xbox Live developers can submit and manage their third-party applications for the platforms through the App Hub web applications. The App Hub provides development tools and support for third-party application developers. The submitted applications undergo an approval process for verifications and validations to check if they qualify the applications standardization criteria set by Microsoft.<ref>{{cite web |title= Introducing App Hub for Windows Phone & Indie Game Developers |url=http://windowsteamblog.com/windows_phone/b/wpdev/archive/2010/10/11/introducing-app-hub-for-windows-phone-7-amp-indie-game-developers.aspx |publisher= [[Microsoft]] |work= The Windows Phone Developer Blog |first=Todd |last=Brix |date= October 11, 2010 |access-date= December 16, 2010}}</ref> The cost of the applications that are approved is up to the developer, but Microsoft will take 20% of the revenue (the other 80% goes to the developer).<ref>{{cite web |url= http://windowsteamblog.com/windows_phone/b/wpdev/archive/2010/03/15/the-right-mix.aspx |title= The Right MIX |work= The Windows Phone Developer Blog |publisher=[[Microsoft]] |first= Charlie |last= Kindel |date= March 15, 2010 |access-date= October 27, 2011}}</ref> Microsoft will only pay developers once they reach a set sales figure, and will withhold 30% tax from non-US developers, unless they first register with the United States Government's Internal Revenue Service. Microsoft only pays developers from a list of thirty countries.<ref name="Reference">{{cite web |url= http://create.msdn.com/en-us/home/faq |title= App Hub – faq: answers at a glance |work= Microsoft Developer Network (MSDN) |publisher= Microsoft |access-date= October 27, 2011 |url-status= dead |archive-url= https://web.archive.org/web/20120229234909/http://create.msdn.com/en-US/home/faq |archive-date= February 29, 2012 |df= mdy-all }}</ref> A yearly fee is also payable for developers wishing to submit apps.<ref>{{cite web|url=http://create.msdn.com/en-US/home/about/how_it_works |archive-url=https://web.archive.org/web/20101014060848/http://create.msdn.com/en-us/home/about/how_it_works |url-status=dead |archive-date=October 14, 2010 |title=App Hub – how it works |work=Microsoft Developer Network (MSDN) |publisher=Microsoft |access-date=October 27, 2011 }}</ref>

In order to get an application to appear in the [[Windows Phone Store]], the application must be submitted to [[Microsoft]] for approval.<ref name="Reference" /> Microsoft has outlined the content that it will not allow in the applications, which includes content that, among other things, advocates discrimination or hate, promotes usage of drugs, alcohol or tobacco, or includes sexually suggestive material.<ref>{{cite web |url= http://msdn.microsoft.com/en-us/library/hh184842%28v=vs.92%29.aspx |title= Windows Phone Marketplace – Content policies |work= Microsoft Developer Network (MSDN) |publisher= Microsoft |access-date= August 17, 2012 |date= July 26, 2012}}</ref>

==Hardware==
{{Main|List of Windows Phone devices}}
Windows Phone 7 devices were first produced by [[HTC]], [[LG]] and [[Samsung Electronics|Samsung]]. These hardware partners were later joined by [[Acer Inc.|Acer]], [[Alcatel Mobile Phones|Alcatel]], [[Fujitsu]], [[Toshiba]], [[Nokia]], and Chinese OEM [[ZTE]].

Windows Phone 8 devices were being produced by HTC, [[Huawei]], Nokia, and Samsung.

At the 2014 [[Mobile World Congress]], Microsoft announced that upcoming Windows Phone 8.1 devices would be manufactured by [[Celkon Mobiles|Celkon]], [[Gionee]], HTC, Huawei, JSR, [[Karbonn]], [[LG]], [[Lenovo]], [[Longcheer]], [[Micromax Mobile|Micromax]], Microsoft Mobile, Samsung, [[Xolo (company)|Xolo]], and [[ZTE]] among others.<ref>{{cite web | title=Microsoft announces new Windows Phone hardware partners, including LG and Lenovo | website=Engadget | date=2014-02-23 | url=https://www.engadget.com/2014/02/23/microsoft-lg-lenovo-windows-phone/ | access-date=2019-11-04}}</ref> [[Sony]] (under the Xperia or Vaio brand) had also stated its intention to produce Windows Phone devices in the near future.<ref>{{cite web |url= http://www.neowin.net/news/the-new-windows-phone-8-manufacturer-that-youve-probably-never-heard-of |title= The new Windows Phone 8 manufacturer... that you've probably never heard of |publisher= Neowin |access-date= 2013-07-11}}</ref> Yezz announced two smartphones in May, and at Computex 2014 BYD, Compal, Pegatron, Quanta and Wistron were also named as new Windows Phone OEMs.<ref>{{cite web|url=http://www.gsmarena.com/blu_prestigio_and_yezz_launch_windows_phone_handsets-news-8699.php|title=Blu, Prestigio and Yezz showcase Windows Phone handsets|website=gsmarena.com}}</ref>

In August 2014, [[Huawei]] said it was dropping support for Windows Phone due to low sales.<ref>{{cite web|url=http://www.neowin.net/news/huawei-drops-windows-phone-citing-lack-of-profit|title=Huawei drops Windows Phone citing lack of profit|website=neowin.net}}</ref>

==Reception==

===User interface===
The Metro UI and overall interface of the OS were highly praised for their style, with ZDNet noting their originality and fresh, clean look.<ref name="zdnet preview">{{cite web
|url= http://www.zdnet.com/blog/cell-phones/microsoft-windows-phone-7-technical-preview-a-definitive-guide/4286
|archive-url= https://web.archive.org/web/20100720192001/http://www.zdnet.com/blog/cell-phones/microsoft-windows-phone-7-technical-preview-a-definitive-guide/4286
|url-status= dead
|archive-date= July 20, 2010
|title= Microsoft Windows Phone 7 technical preview: A definitive guide
| first=Matthew
| last=Miller
| publisher=[[CBS Interactive]]
| work=[[ZDNet]]
| date=July 18, 2010
| access-date=October 23, 2010}}</ref> Engadget and ZDNet applauded the integration of Facebook into the People Hub as well as other built-in capabilities, such as Windows Live, etc. However, in version 8.1, the once tight Facebook and Twitter integration was removed, so updates from those social media sites had to be accessed via their respective apps.<ref>{{cite web | last=Branscombe | first=Mary | title=Windows Phone 8.1: A bittersweet update that appeals to the mainstream | website=ZDNet | date=2013-10-02 | url=https://www.zdnet.com/article/windows-phone-8-1-a-bittersweet-update-that-appeals-to-the-mainstream/ | access-date=2019-11-04}}</ref>

===Market share===
{{update|section|date=June 2015}}
{{align|center|
{{Graph:Chart
| width = 300
| height = 160
| x = 1Q 11, 2Q 11, 3Q 11, 4Q 11, 1Q 12, 2Q 12, 3Q 12, 4Q 12, 1Q 13, 2Q 13, 3Q 13, 4Q 13
| xAxisAngle = -40 
| yGrid= 
| y = 3.6, 1.6, 1.5, 1.8, 1.9, 2.7, 2.4, 3.0, 2.9, 3.3, 3.6, 3.0
}}
}}

====Windows Phone 7 (2010–2012)====
For the first months, market specialists were optimistic about its adoption, with IDC forecasting that Windows Phone would surpass the iPhone by 2015.<ref>{{cite press release |url=https://www.idc.com/getdoc.jsp?containerId=prUS22871611| title=Worldwide Smartphone Market Expected to Grow 55% in 2011 and Approach Shipments of One Billion in 2015, According to IDC |date=August 23, 2011 |archive-date=August 23, 2011 |archive-url=https://web.archive.org/web/20110823224820/https://www.idc.com/getdoc.jsp?containerId=prUS22871611|access-date=2020-08-17}}</ref>

According to [[Gartner]], there were 1.6 million devices running Microsoft OS sold to customers in Q1 2011 worldwide.<ref>{{cite press release |url=http://www.gartner.com/it/page.jsp?id=1689814 |archive-url=https://web.archive.org/web/20110520030626/http://www.gartner.com/it/page.jsp?id=1689814 |url-status=dead |archive-date=May 20, 2011 |title=Gartner Says 428 Million Mobile Communication Devices Sold Worldwide in First Quarter 2011, a 19 Percent Increase Year-on-Year |publisher=[[Gartner]] |date=May 19, 2011 |access-date=August 17, 2012}}</ref> 1.7 million smartphones using a Microsoft mobile OS were sold in Q2 2011, for a 1.6% market share.<ref name=gartner20110811>{{cite press release|title=Gartner Says Sales of Mobile Devices in Second quarter of 2011 Grew 16.5 Percent Year-on-Year; Smartphone Sales Grew 74 Percent|url=http://www.gartner.com/it/page.jsp?id=1764714|archive-url=http://webarchive.loc.gov/all/20110812103323/http://www.gartner.com/it/page.jsp?id%3D1764714|url-status=dead|archive-date=August 12, 2011|access-date=September 29, 2011|publisher=[[Gartner]]|date=August 11, 2011}}</ref> In Q3 2011, Microsoft's worldwide market share dropped slightly to 1.5%.<ref name="Gartner Q3 2011">{{cite press release|title=Gartner Says Sales of Mobile Devices Grew 5.6 Percent in Third quarter of 2011; Smartphone Sales Increased 42 Percent|url=http://www.gartner.com/it/page.jsp?id=1848514|archive-url=https://web.archive.org/web/20111117151246/http://www.gartner.com/it/page.jsp?id=1848514|url-status=dead|archive-date=November 17, 2011|publisher=[[Gartner]]|date=November 15, 2011|access-date=February 7, 2012}}</ref> In Q4 2011 market share increased to 1.9%,<ref name="Gartner Q4 2011">{{cite press release|title=Gartner Says Worldwide Smartphone Sales Soared in Fourth Quarter of 2011 With 47 Percent Growth|url=http://www.gartner.com/it/page.jsp?id=1924314|archive-url=https://web.archive.org/web/20120215223441/http://www.gartner.com/it/page.jsp?id=1924314|url-status=dead|archive-date=February 15, 2012|publisher=[[Gartner]]|date=February 15, 2012 |access-date=August 18, 2012}}</ref> and it stayed at 1.9% for Q1 2012.<ref name="Gartner Q1 2012">{{cite press release|title=Gartner Says Worldwide Sales of Mobile Phones Declined 2 Percent in First Quarter of 2012; Previous Year-over-Year Decline Occurred in Second Quarter of 2009|url=http://www.gartner.com/it/page.jsp?id=2017015|archive-url=https://web.archive.org/web/20120517182956/http://www.gartner.com/it/page.jsp?id=2017015|url-status=dead|archive-date=May 17, 2012|publisher=[[Gartner]]|date=May 16, 2012|access-date=August 18, 2012}}</ref> Reports for Q2, Q3 and Q4 of year 2011 include both Windows Phone and small part of Windows Mobile marketshare under the same "Microsoft mobile OS" banner, and do not make the distinction of separating the marketshare values of the two. According to Nielsen, Windows Phone had a 1.7% market share in Q1 2012,<ref>{{cite web|title=America's New Mobile Majority: a Look at Smartphone Owners in the U.S.|date=May 7, 2012|publisher=[[Nielsen Company|Nielsen]]|work=Nielsen Wire|url=http://blog.nielsen.com/nielsenwire/?p=31688|access-date=August 18, 2012|archive-date=May 9, 2012|archive-url=https://web.archive.org/web/20120509023605/http://blog.nielsen.com/nielsenwire/?p=31688|url-status=dead}}</ref> and then dropped back to 1.3% in Q2 2012.<ref>{{cite web|title=Two Thirds of New Mobile Buyers Now Opting For Smartphones|date=July 12, 2012|publisher=[[Nielsen Company|Nielsen]]|work=Nielsen Wire|url=http://blog.nielsen.com/nielsenwire/?p=32494|access-date=August 18, 2012|archive-date=July 14, 2012|archive-url=https://web.archive.org/web/20120714233605/http://blog.nielsen.com/nielsenwire/?p=32494|url-status=dead}}</ref>

====Windows Phone 8 (2012–2015)====
After the release of [[Windows Phone 8]], Gartner reported that Windows Phone's market share jumped to 3% in Q4 2012, a 124% increase over the same time period in 2011.<ref>{{cite web|url=http://www.gartner.com/newsroom/id/2335616 |archive-url=https://archive.today/20130411001253/http://www.gartner.com/newsroom/id/2335616 |url-status=dead |archive-date=April 11, 2013 |title=Gartner Says Worldwide Mobile Phone Sales Declined 1.7 Percent in 2012 |publisher=Gartner.com |date=2013-02-13 |access-date=2013-06-14}}</ref>

In mid-2012, IDC had suggested that Windows Phone might surpass the faltering [[BlackBerry]] platform and potentially even [[Apple iOS]] because of Nokia’s dominance in emerging markets like Asia, Latin America, and Africa, as the [[iPhone]] was considered too expensive for most of these regions and [[BlackBerry OS]] was possibly going to feature a similar fate as [[Symbian]].<ref>{{cite magazine| url=https://www.wired.com/gadgetlab/2012/06/why-idc-predicts-windows-phone-will-surpass-ios-by-2016/ | magazine=Wired | first=Alexandra | last=Chang | title=Why IDC Predicts Windows Phone Will Surpass iOS by 2016 | date=June 6, 2012}}</ref><ref>{{cite web|url=http://www.eweek.com/c/a/Enterprise-Networking/Microsofts-Windows-Phone-Beats-iOS-by-2015-Analyst-539437/|archive-url=https://archive.today/20130123052049/http://www.eweek.com/c/a/Enterprise-Networking/Microsofts-Windows-Phone-Beats-iOS-by-2015-Analyst-539437/|url-status=dead|archive-date=January 23, 2013|title=Microsoft's Windows Phone Beats iOS by 2015: Analyst|website=eweek.com}}</ref> IDC's projections were partially correct, as in Q1 2013 Windows Phone shipments surpassed [[BlackBerry]] shipment volume for the first time.<ref>{{cite web | last=Miller | first=Matthew | title=IDC: Windows Phone sees largest year-over-year increase, Android still dominates | website=ZDNet | date=2014-09-18 | url=https://www.zdnet.com/article/idc-windows-phone-sees-largest-year-over-year-increase-android-still-dominates/ | access-date=2019-11-04}}</ref> IDC had to slash the Windows Phone predictions once again, to 7 percent of total market in 2018, because of the slow growth.<ref>{{cite web|url=http://www.siliconbeat.com/2014/02/26/windows-phone-forecast-slashed-once-again/|title=Windows Phone forecast slashed once again|date=February 26, 2014|website=siliconbeat.com|access-date=June 6, 2014|archive-date=March 11, 2014|archive-url=https://web.archive.org/web/20140311041215/http://www.siliconbeat.com/2014/02/26/windows-phone-forecast-slashed-once-again/|url-status=dead}}</ref>

As of the third quarter of 2013, Gartner reported that Windows Phone holds a worldwide market share of 3.6%, up 123% from the same period in 2012 and outpacing Android's rate of growth.<ref>{{cite web | last=Gralla | first=Preston | title=New research says Windows Phone has blowout growth, is the "winner of the quarter" | website=Computerworld | date=2013-11-15 | url=http://blogs.computerworld.com/windows-phone/23145/new-research-says-windows-phone-has-blowout-growth-winner-quarter | archive-url=https://web.archive.org/web/20140104204450/http://blogs.computerworld.com/windows-phone/23145/new-research-says-windows-phone-has-blowout-growth-winner-quarter | archive-date=2014-01-04 | url-status=dead | access-date=2019-11-04}}</ref> According to Kantar's October 2013 report, Windows Phone accounted for 10.2% of all smartphone sales in Europe and 4.8% of all sales in the United States.<ref>{{cite web | last=Edmonds | first=Rich | title=10% sales of Windows Phone across Europe | website=Windows Central | date=2013-12-02 | url=https://www.windowscentral.com/windows-phone-10-percent-across-europe-struggle-china-us | access-date=2019-11-04}}</ref> Some analysts have been  attributing this spike in sales to both Windows Phone 8 and Nokia's successful push to market low and mid-range Windows Phones like the [[Lumia 520]] and [[Lumia 620]] to a younger audience.<ref>{{cite web | title=Windows Phone nears double digit share across Europe, Samsung begins to feel pressure from resurgent Sony, Nokia and LG | website=Kantar | url=http://uk.kantar.com/tech/mobile/300913-smartphone-sales-data-great-britain-and-europe/ | access-date=2019-11-04 | archive-date=November 1, 2014 | archive-url=https://web.archive.org/web/20141101012205/http://uk.kantar.com/tech/mobile/300913-smartphone-sales-data-great-britain-and-europe/ | url-status=dead }}</ref> Gartner reported that Windows Phone market share finished 2013 at 3.2%, which while down from the third quarter of 2013 was still a 46.7% improvement from the same period in 2012.<ref name="Gartner 2013 Q4">{{cite web |url=http://www.gartner.com/newsroom/id/2665715 |archive-url=https://archive.today/20140213214112/http://www.gartner.com/newsroom/id/2665715 |url-status=dead |archive-date=February 13, 2014 | title=Gartner Smart Phone Marketshare 2013 Q4 | publisher=Gartner, Inc |access-date=2014-01-13}}</ref>

IDC reported that Windows Phone market share, having peaked in 2013 at 3.4%, had dropped to 2.5% by the second quarter of 2014.<ref>{{cite web|url=http://www.idc.com/prodserv/smartphone-os-market-share.jsp|title=IDC: Smartphone OS Market Share|website=www.idc.com}}</ref>

In August 2017, the [[New York Police Department]] ordered [[Apple Inc.|Apple]] [[iPhone]] products to replace its deployment of 36,000 Lumia 830 and Lumia 640 XL Windows Phone devices, partly citing Microsoft's end of support for Windows Phone 8.1 on July 11, 2017, and its minuscule market share.<ref>{{Cite web|url=https://www.theverge.com/2017/8/28/16215424/nypd-windows-phone-8-1-iphone-8-new-york|title=New York City cops will replace their 36,000 Windows phones with iPhones|last=Liao|first=Shannon|date=2017-08-28|website=The Verge|access-date=2017-08-29}}</ref>

===Developer interest===
Microsoft's developer initiative programs and marketing have gained attention from application developers. As of Q3 2013, an average of 21% of mobile developers used the Windows Phone platform, with another 35% stating they are interested in adopting it.<ref>{{cite web | title=Developer Economics Q3 2013 | website=Developer Economics | url=http://www.developereconomics.com/reports/q3-2013/ | archive-url=https://web.archive.org/web/20130926191729/http://www.developereconomics.com/reports/q3-2013/ | archive-date=2013-09-26 | url-status=dead | access-date=2019-11-04}}</ref> Some reports have indicated that developers may be less interested in developing for Windows Phone because of the lower ad revenue when compared to competing platforms.<ref>{{cite web|url=http://bgr.com/2014/01/22/microsoft-windows-phone-ad-revenue/|title=One astonishing number shows why developers are avoiding Windows Phone|work=BGR|date=January 22, 2014|first=Brad|last=Reed}}</ref> The main criticism of Windows Phone was the lack of applications when compared to iOS and Android.<ref>{{cite magazine|url=https://www.wired.com/gadgetlab/2013/03/windows-phones-app-problem/|title=Microsoft Endlessly Disappoints With 'New' Windows Phone Apps|magazine=Wired|publisher=Conde Nast|date=March 27, 2013|first=Alexandra|last=Chang}}</ref><ref>{{cite web|url=http://www.techradar.com/news/software/applications/windows-phone-has-an-app-problem-but-don-t-tell-that-to-microsoft-1141442|title=Windows Phone has an app problem, but don't tell that to Microsoft|work=TechRadar|publisher=Future plc|date=March 28, 2013|first=Michelle|last=Fitzsimmons}}</ref><ref>{{cite web|url=http://www.latimes.com/business/technology/la-fi-tn-nokia-frustrated-lack-of-apps-windows-phone-20130729,0,5531894.story|title=Nokia frustrated with lack of apps, progress on Windows Phone|date=July 29, 2013|first=Salvador|last=Rodriguez|work=Los Angeles Times}}</ref><ref>{{cite web|url=http://www.thebigcomputing.com/2015/03/the-biggest-problems-with-windows-phone|title=The Biggest Problems with Windows Phone|date=March 26, 2015|first=Saburah|last=Tripathi|work=TheBigComputing|url-status=dead|archive-url=https://web.archive.org/web/20150402115207/http://www.thebigcomputing.com/2015/03/the-biggest-problems-with-windows-phone/|archive-date=April 2, 2015}}</ref> This also affected Microsoft's largest partner in the platform, [[Nokia]], whose vice president showed his frustration at the lack of apps for the platform.<ref>{{Cite web|url=https://www.latimes.com/business/technology/la-fi-tn-nokia-frustrated-lack-of-apps-windows-phone-20130729-story.html|title=Nokia frustrated with lack of apps, progress on Windows Phone|date=July 29, 2013|website=Los Angeles Times}}</ref>

A few developers refused to develop apps while preventing third-party alternatives. A well-known example was [[Snapchat]], which announced a crackdown on third-party apps for its service and its users in November 2014. Microsoft was forced to remove third-party Snapchat apps (including the popular ''6snap'') from the Windows Phone Store a month later, while Snapchat never developed an official app for those users.<ref>{{Cite web|url=https://techcrunch.com/2014/12/21/snapchat-windows-phone-purge/|title=Microsoft Removes All Third Party Snapchat Apps From The Windows Phone Store|date=December 22, 2014 }}</ref> A petition from users requesting an official Snapchat app reached 43,000 signatures in 2015.<ref>{{Cite web|last=Ron|title=Snapchat For Windows Phone Petition Now Has Over 43 Thousand Signatures - OnMSFT.com|date=August 8, 2015 |url=https://www.onmsft.com/news/snapchat-windows-phone-petition-now-has-over-43-thousand-signatures|access-date=2021-03-25|language=en-US}}</ref> In addition, [[Google]] twice blocked Microsoft's own [[YouTube]] app for violating its terms of service, objecting to the app's ability to download videos and prevent ads.<ref>{{Cite news|url=https://www.theguardian.com/technology/appsblog/2013/aug/15/google-disables-windows-phone-youtube-app|title=Google disables Microsoft's Windows Phone YouTube app (again)|first=Stuart|last=Dredge|newspaper=The Guardian |date=August 15, 2013|via=www.theguardian.com}}</ref> The app returned in October 2013 but stripped of many features.<ref>{{Cite web|url=https://www.windowscentral.com/microsoft-updates-youtube-app-surrenders-to-google|title=Microsoft updates YouTube app for Windows Phone, apparently surrenders to Google as web player returns|date=October 7, 2013|website=Windows Central}}</ref>

By 2014, Windows Phone was losing share and relevance; between 2014 and 2015, it was reported that developers were backing out of the platform and retiring apps because of the low market share.<ref>{{cite web|url=http://betanews.com/2015/04/06/windows-phone-keeps-on-losing-major-apps/|title=Windows Phone keeps on losing major apps|work=BetaNews|first=Mihăiță|last=Bamburic|date=April 6, 2015}}</ref><ref>{{cite web|url=http://winsupersite.com/windows-phone/exodus-windows-phone-ecosystem|title=The exodus from the Windows Phone Ecosystem|first=Richard|last=Hay|work=Supersite for Windows|publisher=Penton|date=April 8, 2015}}</ref> Many high-profile apps were discontinued by 2015 such as [[American Airlines]], [[NBC]], [[Pinterest]] and others. In addition, Microsoft itself retired some of its own first-party apps.<ref>{{Cite news|url=https://www.theverge.com/2015/10/23/9602350/microsoft-windows-phone-app-removal-windows-store|title=Windows Phone has a new app problem|first=Tom|last=Warren|date=October 23, 2015|website=The Verge}}</ref>

==See also==
* [[Comparison of mobile operating systems]]
* [[Surface Duo]]
* {{portal-inline|Telephones}}

==Notes==
{{notelist-ua}}
{{notelist}}

==References==
{{Reflist|30em}}

==External links==
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