I've been dealing with this bluetooth static for over a month on my Iphone 11, and also on my wife's Iphone 11. I have been on the phone to Apple, and at the Genius bar twice. I've done soft resets, full complete resets, and nothing works. Turning apps or even siri on off. Still static & warble using bluetooth in the vehicle. Tried 2 different vehicles and no change. Apple recently replaced the phone with a remanufactured one and it has made no difference - same issue. After a reset, we get about one clear call, and the the phone goes back to static. They tested the original phone and said there wasn't anything wrong. This is ever since IOS 13. I want my Iphone 8 back and so does my wife. Two phones have become unusable using bluetooth for calls in our vehicles.