My iPhone XS had zero problems connecting to my car stereo, my iPhone 12 mini can't see or be seen by the same stereo at all.
!?
Can your car stereo be linked to more than one device at a time?
Try unlinking your XS and seeing if the other one can connect.
@Greenbank started
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My iPhone XS had zero problems connecting to my car stereo, my iPhone 12 mini can't see or be seen by the same stereo at all.
!?