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  2. Randall L. Stephenson - Wikipedia

    en.wikipedia.org/wiki/Randall_L._Stephenson

    Randall Lynn Stephenson (born April 22, 1960) is a retired American telecommunications executive. He served as chairman and chief executive officer (CEO) of AT&T Inc. from May 9, 2007 until June 30, 2020 and as executive chairman of AT&T Inc. from July 1 until December 31, 2020.

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

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

    Toll-free telephone numbers in the North American Numbering Plan. Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing ...

  4. History of AT&T - Wikipedia

    en.wikipedia.org/wiki/History_of_AT&T

    The history of AT&T dates back to the invention of the telephone. The Bell Telephone Company was established in 1877 by Alexander Graham Bell, who obtained the first US patent for the telephone, and his father-in-law, Gardiner Greene Hubbard. Bell and Hubbard also established American Telephone and Telegraph Company in 1885, which acquired the ...

  5. AT&T - Wikipedia

    en.wikipedia.org/wiki/AT&T

    AT&T. AT&T Inc. (with "AT&T" being an abbreviation for its former name, the American Telephone and Telegraph Company) is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. [4] It is the world's fourth-largest telecommunications company by revenue and the largest wireless ...

  6. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    A Universal International Freephone Number (UIFN) is a worldwide toll-free "800 number" issued by the International Telecommunication Union. Like the 800 area code issued for the North American Numbering Plan in the United States and Canada and 0800 numbers in many other countries, the call is free for the caller while the receiver pays the ...

  7. Cellular frequencies in the United States - Wikipedia

    en.wikipedia.org/wiki/Cellular_frequencies_in...

    There are 51 MTAs, 493 BTAs and 175 EAs in the United States. The Advanced Wireless Services (AWS) bands, auctioned in the summer of 2006, were for 1,710–1,755 MHz, and 2,110–2,155 MHz. The spectrum was divided into blocks: A blocks were for Cellular Market Areas, based on existing cellular (1G) licenses, and were 2 × 10 MHz.

  8. AT&T Corporation - Wikipedia

    en.wikipedia.org/wiki/AT&T_Corporation

    AT&T Communications. AT&T Corporation, commonly referred to as AT&T, an abbreviation for its former name, the American Telephone and Telegraph Company, was an American telecommunications company that provided voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agencies.

  9. AT&T Michigan Headquarters - Wikipedia

    en.wikipedia.org/wiki/AT&T_Michigan_Headquarters

    AT&T Michigan Headquarters. / 42.3325; -83.0536. The AT&T Michigan Headquarters is a complex of skyscrapers and buildings located at 1st Street, Cass Avenue, State Street, and Michigan Avenue in Downtown Detroit, Michigan. It contains the AT&T Building, the AT&T Building addition, the Maintenance Shop and is owned by communications giant AT&T .

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