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{{short description|Canadian non-geographic area code}}
'''Area code 600''' is a telephone [[area code]] in the [[North American Numbering Plan]] for non-geographic use in [[Canada]] of specialized [[telecommunication]] services such as [[telex]] applications, [[Calling party pays|caller-pays cellular]], [[ISDN]], and [[satellite phone|mobile satellite communication]] services.<ref>{{cite web|url=http://www.areacodehelp.com/canada/canada_area_codes.shtml |title=Canada Area Codes |publisher=Areacodehelp.com |date= |accessdate=September 4, 2009 }}</ref>

One of the area code's most common uses is the provision of [[satellite phone]] service in remote areas of [[Northern Canada]] where conventional telecommunications infrastructure is not available.

Central office prefixes for area code 600 are assigned according to a special set of guidelines issued by the [[Canadian Radio-television and Telecommunications Commission]].<ref>[http://www.crtc.gc.ca/eng/archive/2006/dt2006-41.htm Canadian NPA 600 NXX Code Assignment Guideline]</ref> The guidelines do not define the services that qualify for the non-geographic numbers, but specify that:
{{quote|In the context of NPA 600, Non-Geographic Services are specific telecommunications services that are: 1) approved by the CRTC, or confirmed by the CRTC as not requiring approval, 2) provided by Canadian Telecommunications Service Providers (TSPs), 3) made available on a non-geographic basis to customers located in Canada, and 4) accessible from at least one public Canadian telecommunications network other than the Code Holder's network.<ref>[http://www.crtc.gc.ca/cisc/eng/documents/CNODGL0009A.doc Canadian NPA 600 NXX Code Assignment Guideline] {{webarchive |url=https://web.archive.org/web/20131003161826/http://www.crtc.gc.ca/cisc/eng/documents/CNODGL0009A.doc |date=October 3, 2013 }}, CRTC, June 30, 2006 </ref>}}

The teletypewriter services provided with the area code were previously provisioned with [[Area codes 610, 484, and 835|area code 610]] in the [[Teletypewriter Exchange Service]] (''TWX'') in 1962. The services were reassigned to area code 600 in 1993, returning 610 to the pool of unassigned area codes for general purposes.<ref>{{cite web
|url=https://www.nationalnanpa.com/pdf/old_pl/IL-93-04-026.pdf
|title=Information Letter IL-93/04-026: Introduction of Service Access Code (SAC) 600 in Canada
|publisher=NANPA
|date=1993-04-15
|access-date=2023-08-13
}}</ref> It was reassigned in 1994 to Pennsylvania.

Area code 600 has a capacity of 798 central office prefixes (200 to 999, with [[555 (telephone number)|555]] and [[9-1-1|911]] not issued). Six relief area codes (622, 633, 644, 655, 677 and 688) are reserved by NANPA as subject to assignment in Canada for expansion of non-geographic services<ref>[http://www.cnac.ca/canadian_dial_plan/Canadian_Numbering_and_Dial_Plan.pdf Canadian Numbering Plan and Dialling Plan] {{Webarchive|url=https://web.archive.org/web/20131105012402/http://www.cnac.ca/canadian_dial_plan/Canadian_Numbering_and_Dial_Plan.pdf |date=November 5, 2013 }} Version 5.0, The Canadian Steering Committee on Numbering (CSCN), October 26, 2011, page 13</ref> but have never been used. Area code [[number of the beast|666]] is not assigned. Each block of 10,000 numbers is assigned to one carrier only; [[local number portability|number portability]] or [[number pooling]] is not practiced. A carrier offering multiple, different non-geographic services may request separate prefixes for each.

== See also ==
* [[List of North American Numbering Plan area codes]]
* [[Telephone numbers in Canada]]

== References ==
{{reflist}}

== External links ==
* [http://www.lincmad.com/nongeographic.html Non-geographic Telephone Codes for North America]
* [https://web.archive.org/web/20060828000314/http://www.cnac.ca/other_codes/600/SAC600Guidelines.pdf CSCN Assignment Guidelines: Service Area Code (SAC) 600 NXX Code Assignment (April 13, 1994)]. Archived from [http://www.cnac.ca/other_codes/600/SAC600Guidelines.pdf original] on August 28, 2006 via Wayback Machine. Retrieved September 7, 2019.

[[Category:Area codes in Canada|600]]
[[Category:Telecommunications-related introductions in 1993]]

Area code 600 - Revision history

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