You can test your phone's microphone by making a voice recording using any of the phone's recorders.  The microphone on the phone is not damaged if it records audio in good quality. The steps to record your voice are as follows: 1. Look for Voice Recorder under apps. Install a voice recording app on your phone if you don't already have one. 2. Press the record button to begin a voice recording. 3. Press the pause button to save the recording. 4. Listen to the audio that you just recently recorded. If you can hear everything clearly then there is no problem with your microphone.