I had iPhone 6 iOS 12.xx - it worked seamlessly with Vauxhall vector 06 car stereo bluetooth.
Upgraded to iPhone 13 iOS 15. It will connect a call to the car bluetooth, but now won't hang up. The phone hangs up, but the car stereo/bluetooth line stays as open as if the line is connected still. Only fix so far to pull stereo fuse from the car each time!
Apparently becoming a known issue with Apple at the moment
RussyW
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