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  2. Area codes 513 and 283 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_513_and_283

    AT&T assigned area code 513 to the southwestern quadrant, which included Cincinnati and Dayton. Due to the proliferation of cell phones and pagers in the 1990s, the numbering plan area had to be split in 1996 to provide more central office prefixes and telephone numbers. The eastern and northern portions, including Dayton, received area code ...

  3. Ohio Bell - Wikipedia

    en.wikipedia.org/wiki/Ohio_Bell

    The Ohio Bell Telephone Company, now doing business as AT&T Ohio, is the Bell Operating Company serving most of Ohio and parts of West Virginia. It is a wholly owned subsidiary of AT&T . Its headquarters is the Ohio Bell Building at 750 Huron Road, Cleveland , Ohio , and formerly had a secondary headquarters at 150 East Gay Street, Columbus ...

  4. Area codes 440 and 436 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_440_and_436

    Area code 440 was established on August 16, 1997, in a three-way split of area code 216, one of the original North American area codes, [1] to provide relief from central office prefix exhaustion from increasing popularity of cellular phones and population pressure. [2]

  5. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  6. List of Ohio area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Ohio_area_codes

    In 2016, area code 614 was overlaid with 380 in the Columbus/Central Ohio area for the same reason. In 2020, 326 was added as an all services overlay for 937. Area code 283 was added as an overlay for 513 on April 28, 2023. [2] [3] Area code 436 went into service on March 1, 2024, as an overlay of 440. [4]

  7. Regional Bell Operating Company - Wikipedia

    en.wikipedia.org/wiki/Regional_Bell_Operating...

    A Regional Bell Operating Company (RBOC) was a corporate entity created as result of the antitrust lawsuit by the U.S. Department of Justice against the American Telephone and Telegraph Company (AT&T) in 1974 (United States v. AT&T) and settled in the Modification of Final Judgment on January 8, 1982.