Telephone & Data Systems, Inc. is a diversified telecommunications company, which engages in the provision of communications services, retail wireless connections, broadband, video, and voice connections. It operates through the following segments: UScellular, TDS Telecom, and Corporate, Eliminations, and Other. The UScellular segment provides wireless telecommunications services. The TDS Telecom segment offers communications services through fiber, coaxial, and copper networks. The company was founded by LeRoy T. Carlson in 1968 and is headquartered in Chicago, IL.