I activated my phone yesterday evening and received precisely one phone call with no problems to report. Later in the evening I paired my Motorola H710 Bluetooth headset with the phone and successfully made a test call through the headset. Unfortunately, every call I have tried to make or receive (w/o bluetooth) today has resulted in the person on the other end hanging up because they could not hear me. Some of the time there is a high pitched buzzing sound when I make a call, but in every single case they cannot hear me even if I switch over to speakerphone. Sometimes when I dial a number it will say the call is connected but I hear absolutely nothing. If I use the bluetooth to make a call the other person can hear me just fine. Anyone else have this type of experience? Thoughts as to whether this is bluetooth related or simply a defective phone?