I ran into a problem while listening to my iphone 4 over my car speakers today. I had my iphone plugged into my stereo through the aux. input when i received a call. The music faded and I answered the call like I always had previously with my 3g. In the past the caller's voice would be played over the car speakers and the microphone on the iphone would pick up my voice. With the iphone 4 however it seems like my voice was also being played over the car speakers causing an audio feedback loop. Is this due to the new noise canceling mic on the top? Anyone else having this problem.