U.S. Cellular Telecommunications Visit Website 8410 W. Bryn Mawr Suite 700 Chicago, WI 60631-3486 1-888-944-9400 About Map About U.S. Cellular is the fifth-largest full-service wireless carrier in the United States, providing national network coverage and industry-leading innovations designed to elevate the customer experience. What's Nearby? Distance: 5 10 15 20 25 50 mi.