Unlocking a non-contracted iPhone?
I bought an unlocked 3GS (iOS 4.1) on ebay to use outside the U.S. If I sign up with a carrier in Mexico City, can they unlock it officially? I can't get the phone number from the orig owner to have AT&T unlock it, and I'm afraid I'll do something that will make it unusable. Will it lock if I reset it? If so, could I upgrade it to iOS 5 then, and unlock it again? Or am I stuck with iOS 4.1? There must be a way to officially unlock a non-contracted iPhone that doesn't cost a fortune!
btw I refuse to sign another contract. with AT&T. I don't like their business practices, and I think that Combined Billing is flawed, perhaps deliberately!
iPhone 3GS, iOS 4.1, unlocked with Cydia