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  2. 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]

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

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

    this was the first part of North America to have its code changed three times: from 213 to 714 1951: to 619 in 1982, and to 760 in 1997. was to have originally split off the portion of 760 serving San Diego County to a new 442 area code in late 2008/early 2009; that plan was cancelled. 2009: overlaid by 442. 761.

  4. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    Telephone exchange. A telephone operator manually connecting calls with cord pairs at a telephone switchboard. A modern central office, equipped with voice communication and broadband data capabilities. A telephone exchange, also known as a telephone switch or central office, is a crucial component in the public switched telephone network (PSTN ...

  5. List of United States telephone companies - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    Lumen Technologies, in addition to its role as the RBOC in the areas of 14 states gained from its acquisition of Qwest, Lumen serves other rural, suburban, and smaller city local exchanges, as well as most of the Las Vegas metropolitan area, covering a total of 16 states. Operations in 20 other states were sold to Brightspeed in 2022.

  6. Area codes 214, 469, 972, and 945 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_214,_469,_972...

    Area codes 214, 469, 972, and 945 are telephone area codes in the North American Numbering Plan (NANP) for Dallas, Texas and most of the eastern portion of the Dallas–Fort Worth metroplex. The area codes are assigned in an overlay complex to a single numbering plan area that was the core of one of the original area codes of 1947, area code 214.

  7. Area codes 310 and 424 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_310_and_424

    Area codes 310 and 424 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. The numbering plan area includes the West Los Angeles and South Bay areas of Los Angeles County , a small portion of Ventura County , and Santa Catalina Island , which is located 26 miles (42 km) south.

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