This is a little off topic but does the same go for a wired headphone? Im assuming the headphone jack is multi-function, as in will carry both the mic and stereo audio, so if you plug in just a stereo audio cable that the mic will continue to be used off the phone? The reason I ask is that I have a similar setup in my car but no bluetooth. I have an ipod adapter that syncs up to my stereo and has a line in for aux input. If I could plug into that and get audio out the car speakers and continue to use the mic on the phone thatd be awesome. Im assuming there will be echo / feedback depending on how well the phone mic noise cancells.