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AT&T Inc. is an American multinational telecommunications holding company that is Delaware-registered but headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile telephone services in the U.S. As of 2022, AT&T was ranked 13th on the Fortune 500 rankings of the largest United States ...
AT&T Corporation AT&T Corporation, originally the American Telephone and Telegraph Company, is the subsidiary of AT&T Inc. that provides voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agencies.
The att.net portal has customizable web-based content including news, sports, weather, entertainment, email, applications, products and services. AT&T created att.net as a web portal in 1995 in support of AT&T Worldnet, a dial-up Internet access service. Following the acquisition  of AT&T by SBC Communications, and the subsequent acquisition ...
Also in 1999, AT&T paid US$5 billion to purchase IBM's Global Network business, which became AT&T Global Network Services, LLC. As part of the purchase agreement, IBM granted AT&T a five-year, US$5-billion contract to handle much of IBM's networking needs, and AT&T outsourced some of its application processing and data management work to IBM.
The AT&T Building (formerly known as the SBC Building, the Ameritech Building and the Michigan Bell Building) was completed for the Michigan Bell Telephone Company in 1919  and expanded in 1928. It is located at 1365 Cass Avenue, and occupies the block bordered by First Street, Cass Avenue, State Street, and Michigan Avenue.
AT&T Wireless Services, formerly part of AT&T Corp., 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.
AT&T Mexico(formerly known as Iusacelland Nextel Mexico), also known as AT&T Mexico Wirelessand AT&T Mexico Mobility, is a Mexican mobile telephone operator and subsidiary of AT&T. AT&T Mexico is headquartered in Mexico City. Its mobile network is available in 90% of Mexico, serving 13% of the Mexican wireless market.