If you have the feeling that the microphone of your Samsung Galaxy S9 no longer works correctly or does not work at all, you can check this with a special test.
This is usually the case when the person you are calling cannot understand you. The test described below allows the microphone to be checked without interference due to the reduced driver.
The special thing about this microphone test is that it cannot be influenced by apps. However, the test cannot be called via the Android menu, but only via a special menu that is opened by a Samsung service code.
How to open the microphone test on the Samsung Galaxy S9 is explained here:
Perform the Samsung Galaxy S9 microphone test
First open the phone app on your smartphone.
Then enter the following code using the numeric keypad:
The test window will now open. Mark one of the first two microphone tests.
Then speak something and wait briefly. With a little delay, the speech will then be immediately played back via the Samsung Galaxy S9 loudspeaker.
If you listen to your recording, the microphone of the Samsung Galaxy S9 will work perfectly. If you don't hear anything, there is probably a technical defect.
You should then visit a service shop that is covered by the warranty. You now know how to quickly and easily check the function of the Samsung Galaxy S9 microphone.