> There is a well known mechanism by which it might be possible for you to notice a new device being powered up: coil whine (https://en.wikipedia.org/wiki/Coil_

> There is a well known mechanism by which it might be possible for you to notice a new device being powered up: coil whine (https://en.wikipedia.org/wiki/Coil_whine https://en.wikipedia.org/wiki/Coil_whine). There are other known (though less common) mechanisms, notably RF reception through dental fillings or bridgework. While the barrier to actually hearing intelligible radio broadcasts is pretty high, simple awareness of a nearby transmitting device is... less unlikely, and might exhibit as something like referred pain, or a vague sense of pressure, or be mistaken for tinnitus.