I've been having problems with dropped calls on my 3G since I got it (I'm running 2.1). For the last 2 weeks I had 3G turned off and I didn't drop one call. Today I decided to turn on 3G and lo and behold the first call I made dropped (this is in a 3G area). I called Apple and they recommended a restore (which I don't want to do) or asking AT&T for a new SIM card. Has anyone with this problem solved it by getting a new SIM card? It doesn't seem like it would help but I'm new to GSM and have never had a SIM before. Is it possible that a faulty SIM card could be causing this problem? It would seem to be an iphone/AT&T problem but trying a new SIM is certainly easier than doing a restore and losing all of my emails. Any help is appreciated.