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
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Claude31
Add a CommentRead here that CarPlay issues with iOS 15 should be addressed "soon": h t t p s : / / w w w.macrumors.com/2021/09/30/ios-15-iphone-13-carplay-issues/