The American Bell Telephone Company formed the American Telephone and Telegraph Company (AT&T) subsidiary in 1885. The latter was a successor of the original Bell Telephone Company founded by Alexander Graham Bell in 1877. After expanding services to Arkansas, Kansas, Oklahoma and Texas, through a series of mergers, it became Southwestern Bell Telephone Company in 1920, which was then a subsidiary of American Telephone and Telegraph Company. The company began its history as the American District Telegraph Company, formed in St. ĭuring most of the 20th century, AT&T had a monopoly on phone service in the United States. As of 2022, AT&T was ranked 13th on the Fortune 500 rankings of the largest United States corporations, with revenues of $168.8 billion. It is the world's largest telecommunications company by revenue and the third largest provider of mobile telephone services in the U.S. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas.
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