Hi Guys, I have an iphone 4 that has come to the end of it's contract and I wish to sell it on. I've tried to set the phone back to factory settings but it keeps asking for a passcode that isn't the same as the passcode used to unlock the screen. As far as I'm aware I havent set any other passwords and have exhausted just about every other avenue I know. Please can anyone help me with this? Many thanks.