United States Cellular Corporation provides wireless telephone services under U.S. Cellular brand name in the United States. It owns, operates, and invests in wireless markets. The company principally offers wide area and national consumer plans that can be tailored to a customerÂ’s needs by the addition of features or feature packages. United States Cellular also provides a wide range of wireless handset devices and laptop cards, as well as other accessories, such as carrying cases, hands-free devices, batteries, battery chargers, and other items. In addition, it offers custom usage features, such as wide-area, national, and mobile-to-mobile call delivery; caller id/blocking; call forwarding; voice mail; call waiting; and three-way calling, as well as custom data features comprising email services, instant messaging, and text and picture messaging. The company markets its products and services through various channels, including retail sale and service centers, independent agents, and direct sale, as well as Internet and telesales. As of December 31, 2007, it owned interests in 218 consolidated wireless markets, as well as operated 6,400 cell sites and approximately 400 retail stores in 34 states. The company was founded in 1983 and is headquartered in Chicago, Illinois. United States Cellular Corporation is a subsidiary of Telephone and Data Systems, Inc.