I can hear a high pitched whine emitted from most electronics. Granted for smartphones the display or transceiver has to be powered up and it has to be a quiet

I can hear a high pitched whine emitted from most electronics. Granted for smartphones the display or transceiver has to be powered up and it has to be a quiet room with no white noise. It's a lot better than it used to be, I knew I was getting a call or text from my old Nokia 5160 before it did just from the whine.