 with the networks on which they resell services. Table 3-7 A Sampling of Resellers on Facility- Based Providers' Networks Facility-Based Provider Resellers Consumer Cellular, Cricket Wireless,* H2O Wireless, Net10,** Pix Wireless, TracFone Wireless** Boost Mobile, FreedomPop, Tello, TracFone Wireless, ** Virgin Mobile MetroPCS, Mint Mobile, Net10,* Project Fi, Red Pocket CenturyLink, Comcast, Credo Mobile, GreatCall, Net10,** ** Republic Wireless, TracFone Wireless** *Cricket Wireless is owned by AT&T Mobility **TracFone Wireless and Net10 resell service on multiple networks Resellers purchase services at discounts from facility- based telephone and cable TV providers. They then mark them up, and often offer them below retail cost. Resellers offer services carried on networks owned by AT&T, Sprint, Verizon, T-Mobile, and other carriers worldwide. Sprint's network hosts the most resellers in the United States compared to AT&T and Verizon. www.TechnicalPDF.com Competitive providers such as Windstream and Frontier resell service in areas outside of their own coverage areas. This provides them a way to offer nationwide service. In their own coverage area, these and other competitive providers have their own networks and switches and last-mile broadband facilities. Comcast at one time owned rights to spectrum suitable for cellular service. Spectrum is made up of invisible airwaves over which mobile, satellite and other services' signals are transmitted. Comcast sold their spectrum and instead they now resell mobile services on Verizon's cellular network. CenturyLink and Cincinnati Bell also resell mobile services on Verizon's cellular network. This is less costly because it requires less maintenance and capital for building out a cellular network. Prisoners Call-Families Pay In prisons within the United States, when prisoners call their families or attorneys, they are required to make collect calls. Collect calls are those for which people receiving the call pay rather than the person making the call. In addition, al