United States Cellular Corporation, d.b.a. U.S. Cellular, owns and operates the fifth-largest wireless telecommunications network in the United States, behind Verizon Wireless, AT&T Mobility, Sprint Corporation and T-Mobile US. As of 2013, they serve about 4.6 million customers in 126 markets in 26 U.S. states. The company has its headquarters in Chicago, Illinois.
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