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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.
1955: split to give New Brunswick its own 506 area code; Newfoundland was added to the service area when it joined Canada in 1949. When 506 was created, Newfoundland was assigned to the new code along with New Brunswick. In 1962, Newfoundland received its own code, 709. 2014: overlaid by 782; 851 reserved as a third area code for the region. 903
In 1997, use of area code 403 was restricted to Alberta, with the territories receiving new area code 867. In January 1999, the province was divided into two numbering plan areas. The northern two thirds of Alberta, including Edmonton , received area code 780, while leaving 403 to serve Calgary and southern Alberta.
However, if you get a call from a phone number or area code you don’t know, it’s likely best to avoid picking up the call and research the following before you call back:
403 may refer to: 403 (year) 403 (number) 403 BC; Area code 403; 403 Cyane; Peugeot 403; Bristol 403; IBM 403; HTTP 403 This page was last ...
Map of Oklahoma with area code boundaries. The state of Oklahoma is served by the following area codes: 405/572: Central Oklahoma including Oklahoma City (original area code created in 1947; 572 added as overlay on April 24, 2021 [1] [2] [3] 580: Western and southern Oklahoma (split from 405 in 1997)
Public resistance to the introduction of new area codes, whether as overlay complexes (which allowed customers to keep their existing numbers, but broke seven-digit local calling) or by area code splits (where the area code of existing numbers was changed), prompted the FCC and state commissions to introduce thousands-block number pooling, i.e. the allocation of number space in blocks of only ...
Thus, borders with area codes 403, 204, and 807 were replaced with the single border on area code 867. Area code 514 was split shortly afterward, which changed area code's 819's border with 514 to a boundary with Area code 450, the new area code for the off-island suburbs of Montreal.