When make call can hear person on other end but they can't hear . It's not mic use voice recorder all time and have no problems w FaceTime. My headphones and Bluetooth same thing as far as not being able to be hea

When I make a call, I can hear the person on the other end but they can't hear me. It's not the mic bc face time or voice recorder are not affected. I can't even use my headphones or Bluetooth to get around the problem. This has stumped 2 geniuses, they just try to swap it out for $150.