Motorola H720

Should be no "dial tone" with a cell phone. Can you be a little more specific? What make & model phone are you using, what carrier, and are you having problems making calls, or answering incoming calls?

 

I have not had any problems with my Clarion car stereo or my plantronics headset. In my car, in fact, the 2.1's have worked better than stock, since my car stereo picks up the phone and streams the audio automatically every time I get into the car without having to delete and re-pair (as I had to do with stock).