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O2 are giving away FREE SIM cards and £10 Bonus Credit. Get unlimited calls and texts to O2 numbers when you topup £15 every month. O2 rewards gives you 10% back of your credit every 3 months.
O2 gives you lots of free goodies including O2 priority which gives you exclusive access to thousands of tickets to concerts, bands, gigs and sports events up to 48 hours before public release.