Cellular South Inc. d.b.a. C Spire headquartered in Ridgeland, Mississippi, is the sixth largest wireless provider in the United States and the largest privately held wireless provider in the United States. The company is a full-service provider of transport, Internet and telecom services. C Spire has approximately 1,200,000 customers in Mississippi, the Memphis Metropolitan Area, the Florida Panhandle, parts of Alabama including Mobile.