For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
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Mostly because they needed a wired headset to act as the FM antenna since it needs a decent length to capture FM compared to the much higher UHF and GHz frequencies that the mobile network uses.
Wouldn't you be able to use the coil for wireless charging as a pretty okay antenna?
Imagine blowing out your phone speakers because you put your phone on the charger while listening to the radio.
Typically speaking, it’s a bad idea to use power sources as an antenna. Because power pushes a lot more amps than something like a radio signal.
I mean, we have incredibly simple circuits that can limit amplitude.
My point is that any sort of radio would be immediately drowned out by the massive amounts of EM interference as soon as you tried to charge.
In fact, professional audio devices often have to take extra precautions to avoid their power cables from becoming accidental antennas; Anyone who used a cheap set of computer speakers back in the 2000’s and 2010’s will know the distinct buzzing pattern that preceded a text message or phone call. That’s because cheap speakers would use unshielded power sources, and simple circuitry which didn’t bother to isolate the amplifier from the power.
You could just not allow the user to use the FM tuner while wireless charging
You probably want the NFC antenna for that instead of Qi coils