Weird story...
My cousin had a Curve on the Suncom network (now TMobile) and he had it unlocked and moved over to AT&T. Yesterday he gave it to me and I am on the TMobile network.
When I call people their caller ID says Unknown Number. It did that yesterday when he called me from it on AT&T. So... May be it is a setting on the phone??
If anyone can help me, let me know
Thanks!