I have a strange problem with contacts on my HTC Desire. When I enter a contact I enter the name and phone number and save it. When that person calls me their name is displayed which is good However, if I go back and edit that contact again, say to add an email address, the phone number is blank. If I save it then the phone number is gone.. and "C.21" appears next to their name in the list of contacts when dialing. I've tried re-entering the telephone number and it reappears in the call history but whenever I view or edit the contact the telephone number is gone. Any sugestions?