In case anyone is curious, here is a link to the Bluetooth profiles supported by the Intercept. What Bluetooth Profiles Are Supported On My Virgin Mobile SPH-M910 (Intercept) Phone? I have made one call from the car with the MEX-BT3900U, and experimented with streaming music to the radio from the phone without wires (aux or USB) over Bluetooth. Very cool. I have not experimented with the Phone book to see if that works and I can navigate that on the radio to call whom I wish. I have been told, I'm not sure if this is true yet as I haven't tried it, but the contents of the SDCard can be navigated via the radio to select the song one wishes to play providing the phone is connected to the USB port, just like can be done with an iPod.