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  2. AT&T - Wikipedia

    en.wikipedia.org/wiki/AT&T

    AT&T Inc., simply known as AT&T, 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 third-largest telecommunications company by revenue and the second-largest wireless ...

  3. H2O Wireless - Wikipedia

    en.wikipedia.org/wiki/H2O_Wireless

    www.h2owireless.com. h2o Wireless is a United States-based prepaid cell phone service, that utilizes the AT&T network. [2] It is a brand of mobile virtual network operator (MVNO) Locus Telecommunications, a subsidiary of Telrite Holdings, Inc., since 2019. [1][3] Locus was formerly a subsidiary of KDDI America corporation, starting in 2010. [3 ...

  4. AT&T Internet - Wikipedia

    en.wikipedia.org/wiki/AT&T_Internet

    Website. www.att.com /internet /. AT&T Internet is an AT&T brand of broadband internet service. Previously, AT&T Internet was branded as U-verse Internet and bundled with U-verse TV, which was spun off into the newly independent DirecTV in 2021. AT&T Internet plans powered by fiber-optic cable use the AT&T Fiber brand.

  5. Comparison of mobile phone standards - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_mobile_phone...

    GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM. Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals.

  6. 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 ...

  7. AT&T Mobility - Wikipedia

    en.wikipedia.org/wiki/AT&T_Mobility

    AT&T Mobility, LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the second largest wireless carrier in the United States, with 114.5 million subscribers as of March 31, 2024.

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