FaceTime mic In and Out

If you have a hearing or sound issue on your device then please try some of these processes to set it right

1. If you have a distorted sound issue on your iPhone --> If you hear no sound or distorted sound from your iPhone, iPad
2. If you are not able to hear the other person, click this...>If you can't hear a person on a call or voicemail or if the sound isn't ...
3. If you only hear through speakerphone mode --> If your iPhone is stuck in headphone mode - Apple Support
4. If the other person is not able to listen to you then please click this to identify the issue --> If the microphones on your iPhone, iPad, and iPod touch aren't ...

If the above options do not mitigate the issues then Contact your carrier and then Contact Apple Support

I have an iPhone 11. When I FaceTime friends reception is perfect for me but apparently my conversation breaks up constantly and is received intermittently. (My husband’s iPhone 11 works perfectly, using the same Wi-Fi system.)

I’ve been finding out it has to do with cases. No matter what case you have, for some reason it will muffle the sound. So take it off and keep the mic away from anything else. But it doesn’t completely fix the problem entirely but helps a lot.