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  2. Area codes 678, 470, and 943 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_678,_470,_and_943

    The entire metro Atlanta region with area codes 404, 770, 678, 470, and 943 is a local calling area, one of the largest in the United States, without long-distance charges for calls between area codes. All calls in the area are dialed with ten digits.

  3. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    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]

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

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

    once reserved as a third area code for West Virginia, but it was replaced by a 304-932 exchange area code + exchange number in Charleston; 933: not in use; available for non-geographic assignment easily recognizable code (ERC) 934: New York (Suffolk County on Long Island) July 16, 2016: overlaid on 631; 935: not in use; available for geographic ...

  5. List of Georgia area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Georgia_area_codes

    The state operated with two area codes until May 3, 1992, when area code 706 was created for the two separate areas outside of the metro Atlanta area. Due to complaints from exurban residents who were to be put in 706, they were moved back into 404, which makes every new area code added to the metro area run out of numbers sooner.

  6. BSNL - Wikipedia

    en.wikipedia.org/wiki/BSNL

    BSNL logo used until October 2024. Bharat Sanchar Nigam Limited is an Indian government enterprise and its history can be traced back to British India.The foundation of the telecommunications network in India was laid by the British sometime during the 19th century.

  7. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    A telephone exchange, telephone switch, or central office is a central component of a telecommunications system in the public switched telephone network (PSTN) or in large enterprises. It facilitates the establishment of communication circuits, enabling telephone calls between subscribers.

  8. Area code 770 - Wikipedia

    en.wikipedia.org/wiki/Area_code_770

    Area code 770 is a telephone area code in the North American Numbering Plan (NANP) serving all or part of 29 counties in North Georgia, including most of Atlanta's suburbs. It was created in 1995 in a split of numbering plan area (NPA) 404 .

  9. Category:Telephone exchanges - Wikipedia

    en.wikipedia.org/wiki/Category:Telephone_exchanges

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