I'm going back to the UK from the US and want to use my iPhone 3GS (locked to AT&T) on o2 (official iphone contract), and don't want to deal with unlocks and jailbreaking. 1. I heard that o2 are unlocking phones on November 10. ? If I unlock with blacksn0w and then put my official o2 iPhone sim card in, and try to official unlock, will this work and leave me with a permanent official unlock? I know this is done by IMEI number, so this could work right? 2. Could I somehow make my phone unfixable, take it to an Apple store in the UK and hope they give me a replacement which is locked to o2 instead? How could I do this? Meaning making the phone invulnerable to restoring. Any other, more reliable options, or suggestions? Thanks!