I am currently using the Griffin iTrip FM transmitter to listen to my iPhone 3G on my car stereo. I get strange interference when the phone connects to the cell towers (I am guessing that's what it's doing). Using AirPlane mode stops the interference. However I want to be able to receive calls. If I install a new car stereo with an AUX jack input, will I still get the interference when I plug the headphone jack from the iPhone into the aux jack on the new stereo? I'm not concerned with charging the iPhone or controlling it using the car stereo. I just want to be able to listen to the music without the strange noises. Cheers.