When FaceTime isn't working, how can I fix it?
Check that FaceTime is enabled, that your carrier supports it, and your network connection if FaceTime isn't functioning. Additionally, confirm that the person you are calling has FaceTime and that you have added a phone number or email address.

How do I fix the microphone on my iPhone?
Restart your communication applications and make sure they have access to your microphone if your iPhone's microphone isn't working. Remove any plug-in attachments, clean the microphone holes, and, if necessary, take off the screen protector or case. Try using a headset if it doesn't work after that.gmail

How do I record my FaceTime screen?
Open the Control Center on your iPhone and Select Screen Record to start recording FaceTime calls. Open FaceTime and make your call after that. Open FaceTime on a Mac before launching the Screenshot app. After resizing the Screenshot tool to include the FaceTime Window, click Record Selected Portion and then pick Record.