Which network does each piggybacker use? PROVIDERPIGGYBACKING FIRMEEMajor players: BT Mobile*, Plusnet Mobile*, Utility Warehouse. Smaller firms: 1pMobile*, The Phone Co-op*, Ecotalk, IQ Mobile*, Zevvle, RWG Mobile, To The MoonO2Major players: Giffgaff*, Tesco Mobile*, Sky Mobile*. Smaller firm: Lyca Mobile*Piggybacking your phone network – how to slash costs – MSE www.moneysavingexpert.com › mobiles › piggybacking