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Area code 406 is the telephone area code in the North American Numbering Plan for the entire U.S. state of Montana. It has been Montana's only area code since the American Telephone and Telegraph Company created a nationwide telephone numbering plan in 1947.
2 Area codes by country, state, province, ... 406: Montana (all) ... Newfoundland was added to the service area when it joined Canada in 1949. When 506 was created ...
For international access the NANP is assigned the country code 1, which is dialed as a prefix in the international E.164 telephone numbering plan.. The trunk prefix for dialing long-distance calls, across numbering plan area (NPA) boundaries within Canada or to other NANP countries, is also 1.
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
Each NPA was identified by a three-digit area code used as a prefix to each local telephone number. The United States received seventy-seven area codes, and Canada nine. The initial system of numbering plan areas and area codes was expanded rapidly during the ensuing decades, and established the North American Numbering Plan (NANP).
Area code 403 is a telephone area code in the North American Numbering Plan ... Area Code Map of Canada; References ... 406: British Columbia area codes: 250, 604, ...
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The projected exhaust dates for area codes 403 and 780 were March and October 2009, respectively. In 1997, two area codes, 587 and 825, were reserved by Bellcore for Alberta. [1] The first of the new area codes, 587, entered service on September 19, 2008, as an overlay for the entire province.