What should you do to check if the proximity sensor is working correctly?

To determine if the proximity sensor is functioning correctly, moving the device away from your face during a call is an effective method. The proximity sensor is designed to detect when the device is close to your face, such as during a phone call, and it typically dims the display to prevent accidental touches. If you move the device away and the screen lights up again, it indicates that the sensor is working properly, as it can detect the change in distance.

Other methods like covering the microphone or directly pressing the sensor might not provide clear insight into the sensor's functionality, as they do not directly test the proximity detection capabilities. Using a demo app could help test various features of the device, but it may not specifically isolate the proximity sensor's functionality in the way that observing the screen behavior during a call does. Thus, moving the device away from the face is a straightforward and effective demonstration of whether the proximity sensor is working correctly.