ANAC – Automatic Number Announcement Circuit

https://en.wikipedia.org/wiki/Automatic_number_announcement_circuit

The current use of exchange prefixes for each area code is listed by CNAC;[8] if an exchange changes from “plant test” to reclaimed or active, any former test numbers with the associated prefix are invalidated. Commonly-used test numbers for major carriers include:

555-0311 Rogers (403 Alberta, 519 613 Ontario)
958-2580 Bell Canada (519 613 705 905 Ontario, 450 418 438 514 579 581 819 873 Quebec)
958-ANAC (958-2622) Bell Canada (416 Toronto) (invalid from WIND Mobile)
958-6111 Telus landline (403 780 Alberta, 250 BC)
959-4444 Manitoba Telecom Services (204 MB) (959 is used since 958 is a regular Winnipeg exchange, not a test prefix)
958-9999 Bell Aliant (506 NB, 709 NL)
958-2222 Eastlink
Additional plant test codes may be in use locally in some areas:

403: 555-0311 Alberta (GroupTel – may work in other parts of Canada – untested)
604: 1116 British Columbia (Telus)
604: 1211 British Columbia (Telus)
819: 959-1135 Most of Outaouais region (Bell Canada)
Occasionally, a number in an existing, standard local exchange in the area is used. These will incur a toll (and might not work) outside their home area. Some may be announcing caller ID, which is not the same as ANI. As standard local calls, they are not accessible from ADSL “dry loop”, inbound-only or unsubscribed lines:

403: 705-0311 Calgary, Alberta (Allstream – gives “call cannot be completed as dialled” in other parts of Canada, identifying as Allstream, active November 2019)
416: 477-0034 Toronto, Ontario (Fibernetics – Verified January 2021)
416: 477-0035 Toronto, Ontario (Fibernetics – verified January 2021; this number allows you to leave a message for reasons not yet determined)
416: 981-0001 Toronto, Ontario (verified July 2010) (busy, September 2015)
418: 380-0099 Quebec City (Vid̩otron Рverified 2017)
905: 310-3789 Mississauga, ON (Now no longer includes loop line or ringback. In NPAs where Bell Canada is incumbent, 310-xxxx is assigned as a pseudo-tollfree exchange which may be called at local call rates from an entire area code.)
In Bell Canada territory, +1-areacode-320 was formerly reserved for 320-xxxx test numbers; these were moved to the 958-xxxx range and 320-xxxx reclaimed for use as a standard exchange. The use of N11 prefixes (such as 3-1-1) for test numbers is also deprecated as 3-1-1 now often reaches city hall or municipal services while 2-1-1 is local community information.

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Dar Zuch

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