No need to make any calls to check phone's earpiece and microphone/speaker, with this app you can check these components directly. ▶ Camera You’ll be able to check back/front Camera, turn on face detection switch to test if your camera correctly detects face. Also you’ll be able to check flashlight of your phone. ▶ SENSORS You'll be able to check which sensors are supported by your phone and test if the supported sensors are working correctly on your phone like accelerometer, gyroscope, magnetometer and proximity sensor. You can also generate report and share with others.