I have an Apple iphone 3G and a Pioneer DEH-P7300. I have an aux kit installed for an ipod that I have used for the past year or so, and recently tried my iphone through it with no luck. I then realized there was also a headphone jack with the cords for the aux port currently installed and plugged it into my iphone. It actually works and my music plays clearly through my speakers. But the question is about the calls coming though the speakers. I can hear the person clearly on the other end of the line though my speakers and they can also hear me, but there is a loud echo for the person I am talking to. Is there anyway to reduce/fix this echo? Thanks.