I have an 07 Altima 3.5 SE with navigation and bluetooth. I bought the Samsung SPH M610 phone which was suggested to me that would be compatible with the bluetooth in the car. It paired with the system with the car no problem and I have no problem hearing people on the other end however, people on the other end have a hard time hearing me. They say it sounds like Im in a tunnel. I have taken the car to the dealer and was told nothing is wrong with it. How could that be? I talk to a friend of mine in a 07 G35 with bluetooth and I can hear him fine and in fact cant even tell he is not directly speaking handsfree. The same with other people I know in a Lexus and BMW. Any suggestions?