Originally Posted by MattyB1983

Unfortunately then, 13 months in, you don't have a leg to stand on. If you were 2 or 3 months into your contract then you would of had grounds to cancel the contract free of charge but waiting so long then you've got no chance.
You've got circa 11 months left to go so at the minimum monthly fee you've got about 390 left to pay. I'd sell the iphone for about £200 and then start a new contract with a different company and carry on paying the vodaphone bill every month until the contract is finished. Minus the £200 from the phone you'll be about another £190 out of pocket.