Telephone and Data Systems, Inc. (TDS) is a diversified telecom service provider offering wireless and wireline services in the United States. The company operates through three segments: U.S. Cellular, Wireline and Cable. It owns the majority of U.S. Cellular, a leading wireless operator in the country subscriber-wise. U.S. Cellular provides wireless service coverage for Telephone and Data Systems in a number of markets (primarily in the Midwest), including Milwaukee, Madison, Des Moines, Cedar Rapids, Tulsa, Oklahoma City, Lincoln, Knoxville and Portland. U.S. Cellular caters to both retail consumers and business customers, offering a wide range of products and services, including local, regional and national calling plans, enhanced wireless services, mobile messaging, prepaid services, office products, data services and roadside assistance. Telephone and Data Systems operates its fixed line telecom businesses through its wholly-owned subsidiary, TDS Telecom.