I have an issue with my bluetooth and I'm trying to determine if it's my iphone or my car. I have an iphone 3G and a 2008 Nissan Sentra with built in bluetooth handsfree. When I receive calls, I can answer but I do not hear the person and they do not hear me, and my car bluetooth freezes. I can hang up on the phone, but not with the bluetooth button on the steering wheel(everything is frozen). This only started after the 2.1 upgrade. Is anyone having a similar problem with their iphone and car? I can make calls using my car bluetooth without any issues, only the receiving part is the problem. So, not sure if it's the phone or my car. Thanks for any help or advice anyone has.