Hi, i bought iphone 4 from gumtree, and while selling the phone, seller said its factory unlocked one. But when i inserted my sim, then only i realise that it's a locked one.Then i called up the seller and enquired about it, at last he said its locked to o2 but can be unlocked. I dont want to unlock by jailbroken or any illegal way. I just wanted to know is that any way to unlock genuinely, if not shall i return back to seller, but not in the purchase price please advice. Am ready to pay fee for unlocking the phone officially. (perhaps through apple) Thanks for your help.