Try auto's manual and if you have Nav try it's manual as well. Sounds like you need to be able to turn up the mics volume. Maybe the phones Vol. as well?Just purchased an iphone 3g and I find that when I call someone, no one can hear me when I use the bluetooth function in the car. I didn't have this problem when using my Blackberry. Any adjustments available in the car so I don't have to shout when speaking in the car to people I have called?