Rock Hill Telephone Company, doing business as Comporium Communications, is a one-stop shop for communications services in northern South Carolina. The Comporium Group of companies provide retail and wholesale telecommunications and related services to residential and commercial customers in York and Lancaster counties, as well as in parts of six other counties. It also offers local and long distance telephone services, as well as data and Internet, cable television, and security system services. Comporium serves customers from its 16 retail outlets.