What is a reliable method to test a device's Proximity Sensor?

The reliable method to test a device's Proximity Sensor involves covering the front camera while making a call. The Proximity Sensor is designed to detect when an object, such as your face, is near the device, typically during a call. When you cover the front camera, the sensor should respond by turning off the display, preventing accidental screen touches and actions. This behavior confirms that the sensor is functioning correctly.

In contrast, using third-party software for testing might not provide a definitive evaluation of the sensor's functionality since the reliability and accuracy of such applications can vary. The vibration feature check or monitoring battery drain does not directly assess the proximity detection functionality, as these actions are unrelated to the sensor's primary role of measuring distance to nearby objects.