We use T-Mobile Blackberrys--Bold and Curve, and both phones sound great to the callee. Windows are closed, A/C on--Arizona, you know.

So again they have replaced the TCU and reprogrammed it in the car, besides the mic is there anything else that could be causing this type of problem?? I wish they would have investigated the microphone as I thought that would be an easy fix if it was the culprit. Bottom line if the mic is replaced is that all that can be done?? Thx all for your time and input.

i also have this problem with my iphone 4 my nokia n95 was perfect

Just another data point..

Had a long conversation with a friend driving down the road yesterday and he didn't know I was in the car either - call quality was excellent (cell phone to cell phone).