Speaker and microphone not working well

This helped me for my voice being disconnecting and distortung when on FaceTime calls and when iphone 13pro was put on the table or stand:

1. Launch the FaceTime app on your iPhone or iPad.
2. Make a new FaceTime call. Optionally, have someone call you on FaceTime and make sure to pick it up.
3. While you're on the FaceTime call, bring up Control Center. On devices with Face ID, swipe down from the top right corner. On devices with Touch ID, swipe up from the bottom of the screen.
4. Tap Mic Mode in the upper right of Control Center.
5. Select your microphone audio mode. You can choose Voice Isolation or Wide Spectrum.
6. I changed from Voice Isolation to Wide Spectrum and sound issue stopped.

Hello Kckuts,

Welcome to Apple Support Communities. We understand that there are some issues with your iPhone speaker and microphone on phone calls.

Does this happen on every call with every contact? What exactly happens? Does this happen when calls are on speakerphone?

The following articles should help with these issues.

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker

If the microphones on your iPhone aren't working

Take care.