U.S. Cellular

U.S. Cellular owns and operates the sixth largest wireless telecommunications network in the United States, behind Verizon Wireless, AT&T Mobility, Sprint Nextel, T-Mobile USA, and MetroPCS. They currently serve about 6.1 million customers in 126 markets in 26 U.S. states. The company was created as a subsidiary of Telephone and Data Systems (TDS), Inc., which still owns an 81% stake. At that point, U.S. Cellular used TDMA cell phones in most markets, but has completed shifting over to 1xRTT CDMA technology and is currently converting its network to EVDO. U.S. Cellular has since discontinued all analog and TDMA services, and now the plan is to use GSM-based LTE for its future 4G network.