I was at ATT and there was this guy talking to the lady about the iphone 4. He had a 3GS and asked if there were problems with the signal because lately in the past week his signal has been weak. and the ATT rep said yes it has been down or something like that.. I think all these extra iphones are really screwing up atts network.. they cant handle them. Which is why we need another carrier..I am still sticking with att though.