I am not sure if you are describing this well – a microphone can’t beep, nor should it produce any “ghost-sounds” via proximity to a phone.
However,there’s a similar phenomenon: radios can pic up a cellphones transmissions if in close proximity, resulting in a beeping noise. This is simply the radio picking up the cells transmissions and interpreting them wrongly as sound.
However, this should not happen to any playback devices, unless tuned for am/fm frequencies.
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