What is the best way to hook the HTC Thunderbolt up to my car stereo system in hands free? Most state laws require this now. My stereo does not have bluetooth that I know of. I would like to make calls through my stereo however (hear people talking back to me through the car speakers). Is this possible? Please provide links of products. Also for me to talk to them do I just get a standard bluetooth headset or is there a better way to go about it? P.S. I do have an aux input to my Pioneer stereo but I believe that is just for playing music off the phone into the stereo.