The FaceID subsystem is already pulsing periodically (N seconds?) on iPhones, e.g. to check for human attention. Apple could also use WiFi 7 Sensing (which can fingerprint humans by heartbeat) to trigger on human presence and determine when a full facial recognition scan was needed.
While true, I think the parent meant more that the camera would be active constantly, instead of a mic.
The FaceID subsystem is already pulsing periodically (N seconds?) on iPhones, e.g. to check for human attention. Apple could also use WiFi 7 Sensing (which can fingerprint humans by heartbeat) to trigger on human presence and determine when a full facial recognition scan was needed.