I just bought a preowned smart car and it has an auxilary jack in the glove box. I've already been able to play music through the car speakers with a male to male 3.5mm cable and an htc all-in-one adapter as well as using a headphone switch widget since cupcake seems to have a problem working with the htc adapter. Problem I have is with trying to use this setup for hands free. If I have it set up and I make or receive a call, I can hear the caller through the car speakers but they cannot hear me. I tried speaking directly into the mic as well as plugging the oem wired headset into the usb port on the adapter but still they caller cannot hear me. Does anybody have any ideas as to how I can get this to work?