Spies can eavesdrop on phone calls by sensing vibrations with radar

Spies can eavesdrop on conversations by using radar to detect tiny vibrations in smartphones and AI to accurately transcribe them. The trick even works in noisy rooms as the radar homes in on the phone’s movement and is entirely unaffected by background hubbub.

Millimetre wave sensing is a form of radar that can measure movements of less than 1 mm by transmitting pulses of electromagnetic wave energy and detecting the reflected beams.