my partener has and i phone 4, which we put a pin lock on, last night he changed the pin code, then this morning he decided to change back to the one we originally had on it,. So you have to enter the number in twice to confirm what you have entered. next time we went to use thew phone, it said wrong password. we have tried it several times and even tried the one we changed it too, but we are now getting locked out of it for periods of up to an hour. surely when registering the number we couldnt of made the same mistake twice. has this happened to anyone, is it a fault in the phone?