I just bought this iPhone off of some guy who said it was broken and he didn't know what was wrong with it really. The problem is: If you leave the phone to lock, the phone turns off instead of locking like normal. The phone will turn back on after it turns off. The water sensor has been tripped, so I can't take it to Apple. Also, the serial number starts with three numbers in a row instead of a number then a letter, then another number. Any help?