'My Number' showing the wrong number
The 'My Number' in All Contacts is wrong. It shows the SIM card's original number but I transfered my own number to this SIM from day one. I tried going into Settings/Phone/My Number but it appears that is locked and I cannot change it. Restart the phone and re-inserting the SIM card does not appear to be solving the problem. Any further thoughts?
iPhone 4S, iOS 5.0.1