Yeah, i have talked to cingular and blackberry and i gave the pin and imei to both.
The weirdest thing happened this mourning, i left my sim in the phone all night and when i woke up this mourning it was receiving emails, and the signal was strong (the beeping woke me up).
I was happy all the way through my mourning routine, then came back to the phone to see it went back to no service and had no signal, lost again.
I checked and wireless was still on, i went to network settings and it still read *none* and would not let me change it. I yanked the battery, it powered back up and still no signal.