I recently upgraded my iPhone from a 3G to a 4S. The latter uses Bluetooth 2, which I think is the source of my problem. I have no trouble connecting, but now incoming calls don't show the caller's name from my Prius phonebook; only the phone number shows (and sometimes not even that). With my iPhone 3G, I didn't have this problem. I'm assuming that the new behavior is because the iPhone 4S uses Bluetooth 2 and there may be a slight incompatibility with my 2006 Prius Bluetooth. Does anyone know if this is the problem and whether there's anything I can do about it? Thanks.