Suncom Wireless 317 W. Wesmark Blvd Sumter, SC 29150 Phone : (803) 236-8900 Suncom Wireless Business Category Radiotelephone Communications Cellular & Wireless Telephone Service Cingular Wireless 317 W Mark Blvd Sumter, SC 29150 Phone : (803) 236-8900 Business Category Radiotelephone Communications Cellular & Wireless Telephone Service Cellular Telephones-Equipment & Supplies