Iphone 13 bad voice communication when speker on

Hi ozzzi,

Welcome to the Apple Community.

Wondering if this is in the Voice Memos app, watching movies etc, or only during phone calls etc.

and

Have you tried restarting your iPhone ...

or

checking your cellular connection with your provider

or

Tried updating to the newest iOS version:

About iOS 15 Updates - Apple Support

Apple support have articles online that may help:

Eg: If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

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Other articles:

Change iPhone sounds and vibrations – Apple Support

Listen with spatial audio for AirPods and Beats – Apple Support

If the microphones on your iPhone aren't working – Apple Support

All the best :-)