If you have installed iOS 11.3 on your iPhone 7 and the microphone does not work anymore, you should speak to Apple.
Well, in person that is 🙂 The microphone in some iPhone 7 models may not work anmyore after installing 11.3. This seems to be a problem between the software and the chip of the microphone, which does not seem solvable. The sound pickup is therefore permanently without function.
If you are affected by this, just kindly turn to Apple and describe the problem. Apple should offer a free repair in this case, even outside the warranty period.
