if you are getting the static sound through your speakers, like when a call is about to come through, thats the phone...if the equipment in your car stereo is not shielded properly, you will get that noise, no matter what you do. if this is in your budget, you may want to get an aftermarket stereo that is iPod ready/has the AUX. a decent one can run you about $200...or if your system is bluetooth capable and you get the adaptor(about $200). you can do music through bluetooth with the 3Gs...i use it, sounds pretty good and my phone is far enough away from the equipment so i dont get that static interference