The iPhone does not support the services under BT that would make that possible.
The only vulnerability is accessing the headset profile, which is usually done with headsets that have known default pairing codes (since this is the seed that encrypts the traffic). So if someone knows the pairing code that you had to use to pair, they can eavesdrop on your conversations by activating your phone's mic with the right software. In my experience, it's pretty rare given the range, but still.
Note that this permits you to listen in on the phone's mic -- not on phone calls.
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