Re: 87.9 MHz FM Car Radio receives phone calls. Explanation?
I still think the explanation in #6 is the most likely. People using Bluetooth connected mobile phones are very unlikely to go to the trouble of unpairing the connection if they want to make a phone call - they'll just turn the volume down on the car radio. I used a very similar cheap microtransmitter in the car a few years ago, and never bothered turning it off.
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