Telephone and Data Systems, Inc., a diversified telecommunications service company, provides wireless and wireline telecommunications services in the United States. The companyĺs wireless services comprise postpaid and prepaid service plans, which consist of voice minutes, messaging, and data services; national consumer plans; business rate plans; smartphone messaging, data, and Internet services to access the Web, e-mail, social network sites, text, picture and video messages, and turn-by-turn GPS navigation, as well as to browse and download various applications; and data services, including news, weather, sports information, games, ring tones, and other services. It provides wireless devices, such as handsets, modems, and tablets; and a range of accessories comprising carrying cases, hands-free devices, batteries, battery chargers, and memory cards, as well as wireless device repair services. The company also offers voice services, including local and long-distance telephone service, voice over Internet protocol, voice mail, caller ID, and call forwarding services; broadband services comprising digital subscriber lines and other high-speed Internet data services; network access services; hosted and managed services consisting of co-location, hosting, hosted application management, and cloud computing services; and satellite and terrestrial video services to commercial and residential customers and carriers. In addition, it provides printing and distribution services. As of December 31, 2011, the company served approximately 5.9 million wireless customers and 1.1 million wireline equivalent access lines. It sells its products through retail sales and service centers, direct sales, and independent agents, as well as through Website and telesales. Telephone and Data Systems, Inc. was founded in 1968 and is headquartered in Chicago, Illinois.