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  2. Area codes 510 and 341 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_510_and_341

    Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes.Area code 510 is shown in red. Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in the U.S. state of California.

  3. List of California area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_California_area_codes

    Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes. In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes.

  4. Area codes 213, 323, and 738 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_213,_323,_and_738

    In 1947, when the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes, the state of California was divided into three numbering plan areas: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [1]

  5. Telephone directory - Wikipedia

    en.wikipedia.org/wiki/Telephone_directory

    A "white pages" telephone directory. A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone ...

  6. Area codes 619 and 858 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_619_and_858

    On June 30, 1998, the NANPA approved a request by the California Public Utilities Commission for a two-phase three-way split of 619 such that the first phase would introduce the new 858 area code to northwest San Diego County on June 12, 1999, after which the southern and eastern parts of the county would be split off into a new 935 area code ...

  7. 411 (telephone number) - Wikipedia

    en.wikipedia.org/wiki/411_(telephone_number)

    Direct-distance dialing (DDD) was first introduced in areas with common-control switching (panel and crossbar) in the 1950s.These areas had used 411 for directory assistance, and because of the ability of common-control switching to analyze the initial digits of a number in a "sender" before routing the call, these areas did not require the dialing of an initial 1 to initiate a long-distance call.

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