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AT&Tâs corporate office contacts are listed below. Anyone who wishes to get in touch with the companyâs head office must go through these channels. AT&T Headquarters Phone Number. +1-210-821-4105. The Headquarters Switchboard Hours are Monday through Friday, from 9 a.m. to 5 p.m. (Central Time Zone) Please note, that while AT&Tâs corporate headquarters are in Dallas, the main telephone number uses a San Antonio area code. AT&T Headquarters Address.