Speaker not working iPhone 12 Pro

Hi rosietx,

Welcome to the Apple community.

Apple support have articles online (links below) that may help:

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

Or

If you can't hear a person's voice clearly,, learn what to do:

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

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If you still need help:

You might want to take your iPhone in to an Apple Store for hands-on hardware support.

A Genius Bar reservation is recommended:

How to make a Genius Bar reservation at your favourite Apple Store,

Genius Bar Reservation and Apple Support Options - Apple

Or

Apple phone numbers around the world

Contact Apple for support and service - Apple Support

All the best :-)