Mobile News reports that O2 MVNO Giffgaff claims 40 percent of its customer base, which now totals 6,000, will receive cash and credit ‘rewards’ this month. O2-backed Giffgaff operates on the premise of ‘community spirit’, with users rewarded for helping other members with general queries, having opinions on how the network should run and introducing friends to the service. Members are rewarded with points, redeemable as cash, credit or as charity donations.