My brother had the brilliant idea to hold down the pound button to turn off vibrate (I didn't know how) and now the phone is locked. According to the manual, since the code isn't set I have to give it the "last four digits of ESN DEC if your mobile phone number is not set." I have no idea what that is, and I'm assuming that's what I'm supposed to use, since the last four digits of my phone number didn't work. Can anyone help?