AT&T Inc. (English: AT&T Inc., originally short for American Telephone & Telegraph, is also the Chinese translation of the American Telephone & Telegraph Company from, but in recent years has not used the full name), is an American telecommunications company, the second largest mobile operator in the United States, founded in 1877, had a long-standing monopoly of the U.S. long-distance and local telephone market. The company was founded in 1877 and has long monopolized the U.S. long-distance and local telephone market.