giffgaff costs you miles less than other mobile networks. We are an online SIM only business and our standard rates are less than half those charged by the big networks. We promise to always keep things simple and to always do our best to be fair.You're the boss. When you join giffgaff for your mobile service, you become the owner of the company. Everyone who uses giffgaff owns giffgaff. At giffgaff, you're the priority. You get the very lowest SIM tariffs available, but you also get as many minutes and as much data as you need.