Hi, This probably started recently. My iPhone 5S connects to the car's bluetooth w/o issues. I can listen to music, videos, receive calls, call anyone, etc w/o issues. Except when the voice call connection in made. That is when the problem! I cant hear the person on the other end. I turned my phone and my stereo sound as high as they can go. I tried everything: deleting and re-adding the bluetooth device, deleting all the bluetooth devices, resetting all the phone setting and restoring the device, I also messed with a few other settings, etc ... nothing worked. My wife's iPhone 5C worked w/o issues. Unfortunately she doesn't drive that car. I have a iPhone 5S running 10.2. Any ideas? Thank you!!!