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This became mandatory on September 12. On September 20, Telus Mobility began allocating telephone numbers starting in area code 587 in the Calgary area. [5] An overlay was chosen rather than a splitting 403 or 780, which would have resulted in subscribers in portions of Alberta to change their telephone numbers for the second time in a decade.
Local calls from Canadian landlines are dialled without the trunk prefix. Overseas calls to locations outside the NANP are dialled with the 011 international prefix, followed by the country code and the national significant number. Canada was divided into nine numbering plan areas with unique area codes in 1947 when the American Telephone and ...
0–9. Area codes 204, 431, and 584; Area code 250; Area codes 306, 639, and 474; Area codes 418, 581, and 367; Area code 403; Area codes 416, 647, and 437
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
Area code 403 is a telephone area code in the North American Numbering Plan (NANP) for the Canadian province of Alberta. The numbering plan area encompasses the southern third of the province, which includes the Calgary area. This numbering plan area is also served by area codes 587, 825, and 368, which form a complex overlay for all of Alberta.
1-NPA-555-01XX is used for fictional telephone numbers; 1-NPA-555-1212 is used for directory assistance; and other 1-NPA-555-XXXX numbers can be used for other 555 services; 556: not in use; available for personal communications services: 557
On September 20, 2008, Telus Mobility began to assign 587 telephone numbers to new customers in Calgary and Edmonton. On April 9, 2016, all three numbering plan areas of the province were overlaid with an additional area code, 825. [5] On January 21, 2022, the province was once again overlaid with another area code, 368. [6] [7]
Overlay complexes are used to add central office prefixes in an NPA to increase the number of available telephone numbers. [1] Overlay area codes ... Alberta: 829 ...