This guide will help to fix the microphone problems on any iPhone, if the problem is hardware you can use this how to and confirm if the microphone is broken...
FIX No Sound In Calls or Microphone Not Working On Any IOS Devices Step By Step Guide
This guide will help to fix the microphone problems on any iPhone, if the problem is hardware you can use this how to and confirm if the microphone is broken or if it is a software problem. If it is a software problem, it is very likely to be the phone noise cancellation that has gone wrong. The simple fix is to disable this feature and restart the phone and see if that fixes the problem. If it does fix it, you could try turning the noise cancellation back on and it will probably work fine again, but if not just leave it off.
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