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  2. List of California area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_California_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. The state of California was divided into three numbering plan areas (NPAs) with distinct area codes : 213 , 415 , and 916 , for the southern, central, and northern parts of the ...

  3. AT&T Switching Center - Wikipedia

    en.wikipedia.org/wiki/AT&T_Switching_Center

    The AT&T Madison Complex Tandem Office is a 17-story, 79 m (259 ft) building in Los Angeles, California, completed in 1961.With its microwave tower, used through 1993, bringing the overall height to 137 m (449 ft), it is the 29th tallest building in Los Angeles.

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

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

    2023: returned to the pool of area codes available for future area code relief; 457: Louisiana (Shreveport–Bossier City, Monroe, Alexandria, Fisher, Tallulah, and most of northern Louisiana) September 25, 2025 [3] to be overlaid on 318; previously a fictitious area code assigned to identify Naked DSL/Dry Loop and dedicated data lines in ...

  5. Pacific Bell - Wikipedia

    en.wikipedia.org/wiki/Pacific_Bell

    On November 18, 2005, SBC completed its acquisition of AT&T Corp. to form AT&T Inc. Pacific Bell is now known as "Pacific Bell Telephone Company", dba AT&T California. In 2006, the company's direct parent, originally Ameritech, became AT&T Teleholdings due to an internal reorganization at AT&T. Its former direct parent, Pacific Telesis Group ...

  6. 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.

  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 third largest wireless carrier in the United States, with 116 million subscribers as of September 30, 2024. [3]

  8. AT&T Wireless Services - Wikipedia

    en.wikipedia.org/wiki/AT&T_Wireless_Services

    AT&T Wireless Services, Inc., formerly part of AT&T Corporation, was a wireless telephone carrier founded in 1987 in the United States, based in Redmond, Washington, and later traded on the New York Stock Exchange under the stock symbol "AWE", as a separate entity from its former parent.

  9. AT&T Communications - Wikipedia

    en.wikipedia.org/wiki/AT&T_Communications

    AT&T Phone (formerly AT&T U-verse Voice) is a voice communication service delivered over AT&T's IP network . This phone service is digital and provides a voicemail service accessed by *98 from the home number. Customers who subscribe to both AT&T Phone and U-verse TV get features such as call history on channel 9900, which displays the last 100 ...

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