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

    en.wikipedia.org/wiki/List_of_North_American...

    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. Lists of North American area codes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_North_American...

    The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union.

  4. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    By the early 1960s, DDD had become commonplace in cities and most towns in the United States and Canada. By 1967, the number of assigned area codes had increased to 129 as demand for numbers led to splits of some areas and other countries joined the system. [7]

  5. Category:Lists of United States area codes - Wikipedia

    en.wikipedia.org/wiki/Category:Lists_of_United...

    Pages in category "Lists of United States area codes" The following 52 pages are in this category, out of 52 total. This list may not reflect recent changes. *

  6. Category:Area codes in the United States - Wikipedia

    en.wikipedia.org/wiki/Category:Area_codes_in_the...

    Pages in category "Area codes in the United States" The following 200 pages are in this category, out of approximately 296 total. ... Toll-free telephone number; 0 ...

  7. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    The first automated toll-free telephone numbers were assigned with area code 800, created as inbound Wide Area Telephone Service (InWATS) in 1966 (U.S. intrastate) and 1967 (interstate). These terminated on special fixed-rate trunks which would accept calls from a specified calling area with either no limit or a specific maximum number of hours ...

  8. Richest and poorest area codes in the US - AOL

    www.aol.com/article/finance/2017/12/08/richest...

    A phone number communicates a lot --and if you dig a little deep, an area code contains information about the economic situation of its residents, too. Richest and poorest area codes in the US ...

  9. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    A broad division is commonly recognized between closed and open numbering plans. A closed numbering plan, as found in North America, features fixed-length area codes and local numbers, while an open numbering plan has a variance in the length of the area code, local number, or both of a telephone number assigned to a subscriber line. The latter ...

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