William P. Clark

SBC Communications, Inc. provides telecommunications services primarily in the United States. It offers various services and products, such as local exchange services, wireless communications, long-distance services, Internet services, telecommunications equipment, and directory advertising and publishing services. The company provides landline telecommunications services, such as local, long-distance voice, switched access, data and messaging services, and satellite television services; mobile wireless voice and data communications services; and directory services, such as advertising, Yellow and White Pages directories, and electronic directory publishing