Pay Monthly customers Your iPhone can be unlocked at anytime free of charge. If you unlock your handset and place a non-O2 sim into it, you will still have to honour the remainder of the minimum term on your contract. iPhone Pay & Go customers For iPhone on Pay & Go, unlocking can take place 12 months after you've bought your iPhone for a one-off £15 fee which will be deducted from your airtime balance. What do I need to do? Firstly, complete the unlocking form - it will take up to 14 days for the iPhone to be unlocked and we'll text you to confirm the unlock request. Then place a non-O2 sim into the iPhone and connect to iTunes via a USB cable. iTunes will confirm that the iPhone has been successfully unlocked. - Giraffes Up In The AIr from Bookmarklet