# Area code 600 > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Area_code_600 > Markdown URL: https://mediated.wiki/source/Area_code_600.md > Source: https://en.wikipedia.org/wiki/Area_code_600 > Source revision: 1312186691 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) Canadian non-geographic area code "Area code 688" redirects here. For the country calling code, see [+688](/source/%2B688). **Area code 600** is a telephone [area code](/source/Area_code) in the [North American Numbering Plan](/source/North_American_Numbering_Plan) for non-geographic use in [Canada](/source/Canada) of specialized [telecommunication](/source/Telecommunication) services such as [telex](/source/Telex) applications, [caller-pays cellular](/source/Calling_party_pays), [ISDN](/source/ISDN), and [mobile satellite communication](/source/Satellite_phone) services.[1] One of the area code's most common uses is the provision of [satellite phone](/source/Satellite_phone) service in remote areas of [Northern Canada](/source/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](/source/Canadian_Radio-television_and_Telecommunications_Commission).[2] The guidelines do not define the services that qualify for the non-geographic numbers, but specify that: 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.[3] The teletypewriter services provided with the area code were previously provisioned with [area code 610](/source/Area_codes_610%2C_484%2C_and_835) in the [Teletypewriter Exchange Service](/source/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.[4] It was reassigned in 1994 to Pennsylvania. Area code 600 has a capacity of 798 central office prefixes (200 to 999, with [555](/source/555_(telephone_number)) and [911](/source/9-1-1) 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[5] but have never been used. Area code [666](/source/Number_of_the_beast) is not assigned. Each block of 10,000 numbers is assigned to one carrier only; [number portability](/source/Local_number_portability) or [number pooling](/source/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](/source/List_of_North_American_Numbering_Plan_area_codes) - [Telephone numbers in Canada](/source/Telephone_numbers_in_Canada) ## References 1. **[^](#cite_ref-1)** ["Canada Area Codes"](http://www.areacodehelp.com/canada/canada_area_codes.shtml). Areacodehelp.com. Retrieved September 4, 2009. 1. **[^](#cite_ref-2)** [Canadian NPA 600 NXX Code Assignment Guideline](http://www.crtc.gc.ca/eng/archive/2006/dt2006-41.htm) 1. **[^](#cite_ref-3)** [Canadian NPA 600 NXX Code Assignment Guideline](http://www.crtc.gc.ca/cisc/eng/documents/CNODGL0009A.doc) [Archived](https://web.archive.org/web/20131003161826/http://www.crtc.gc.ca/cisc/eng/documents/CNODGL0009A.doc) October 3, 2013, at the [Wayback Machine](/source/Wayback_Machine), CRTC, June 30, 2006 1. **[^](#cite_ref-4)** ["Information Letter IL-93/04-026: Introduction of Service Access Code (SAC) 600 in Canada"](https://www.nationalnanpa.com/pdf/old_pl/IL-93-04-026.pdf) (PDF). NANPA. 1993-04-15. Retrieved 2023-08-13. 1. **[^](#cite_ref-5)** [Canadian Numbering Plan and Dialling Plan](http://www.cnac.ca/canadian_dial_plan/Canadian_Numbering_and_Dial_Plan.pdf) [Archived](https://web.archive.org/web/20131105012402/http://www.cnac.ca/canadian_dial_plan/Canadian_Numbering_and_Dial_Plan.pdf) November 5, 2013, at the [Wayback Machine](/source/Wayback_Machine) Version 5.0, The Canadian Steering Committee on Numbering (CSCN), October 26, 2011, page 13 ## External links - [Non-geographic Telephone Codes for North America](http://www.lincmad.com/nongeographic.html) - [CSCN Assignment Guidelines: Service Area Code (SAC) 600 NXX Code Assignment (April 13, 1994)](https://web.archive.org/web/20060828000314/http://www.cnac.ca/other_codes/600/SAC600Guidelines.pdf). Archived from [original](http://www.cnac.ca/other_codes/600/SAC600Guidelines.pdf) on August 28, 2006 via Wayback Machine. Retrieved September 7, 2019. --- Adapted from the Wikipedia article [Area code 600](https://en.wikipedia.org/wiki/Area_code_600) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Area_code_600?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.