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? 1-888-720-8856 AT&T mail Customer Care Number and the largest provider of fixed telephone services in the United States, and also provides broadband subscription television services through DirecTV. AT&T is the third-largest company in Texas. As of May 2014, AT&T is the 23rd-largest company in the world as measured by a composite of revenues, profits, assets and market value, and the 16th-largest non-oil company? 1-888-720-8856 AT&T mail Customer Care Number