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  2. List of North American Numbering Plan area codes - Wikipedia

    The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.

  3. Telephone numbering plan - Wikipedia

    In California and New York, because of the existence of both overlay area codes (where an area code must be dialed for every call) and non-overlay area codes (where an area code is dialed only for calls outside the subscriber's home area code), "permissive home area code dialing" of 1 + the area code within the same area code, even if no area ...

  4. Telephone number - Wikipedia

    For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number. If the numbering plan area does not use an overlay plan with multiple area codes, or if the provider allows it for other technical reasons, seven-digit dialing may be permissible for calls ...

  5. Area codes 201 and 551 - Wikipedia

    History. Area code 201 was the first-assigned numbering plan area (NPA) code of the original NPAs when AT&T devised the North American Numbering Plan in 1947. It was also the first area code with Direct Distance Dialing (DDD) service, when in 1951 the first direct-dialed long-distance call was made from Englewood, New Jersey to Alameda, California.

  6. Imperial County, California - Wikipedia,_California

    442/760 – Covers all of the El Centro metropolitan area as well as Palm Springs, Oceanside, Bishop, Ridgecrest, Barstow, and Needles; northern San Diego County; and southeastern California, including much of the Mojave Desert and the Owens Valley. Area code 760 split from area code 619 on March 22, 1997, and was overlaid with area code 442 in ...

  7. Area codes 208 and 986 - Wikipedia

    Area code 208 is one of the 86 original area codes created by AT&T in 1947. It was Idaho's sole area code until 2017, when 986 was added as an overlay plan for the entire state. Because of its small population, Idaho was among a declining number of North American jurisdictions with only one area code.

  8. Area codes 809, 829, and 849 - Wikipedia,_829,_and_849

    Area codes 809, 829, and 849 are telephone area codes in the North American Numbering Plan (NANP) for the Dominican Republic.As all NANP members, the Dominican Republic uses country code 1, and has similar dialing procedures for dialing the ten-digit national telephone numbers, which consist of the area code, a three-digit central office code, and a four-digit line number.

  9. Automatic number announcement circuit - Wikipedia

    1956 or 0 (8) 320-1231 area code and number; 1957 or 0 (8) 320-1234 local number; Subscribers may also dial +64 (8) 320-1231 from overseas to test if the (CPN) Caller ID number is being passed on to New Zealand; this should announce the area code and local number as it appears on call display. South Africa +27 21 405 9111 Cape Town ANAC