I have a galaxy s6 which I've had for over a year. When I connect my phone to my bluetooth car radio, it connects flawlessly and plays media no problem. But when I make or receive a call, the radio goes into phone mode but there is no sound. I can't hear them and they can't hear me. I have tried all the cache wipes and have done safe mode tests and even done a factory reset through the phone and the recovery with still no fix. Has anyone had or know of this problem and how to fix it as I have gave up. Many thanks.