Iphone 12 speaker not working

Hello CLaubua,

We're happy to suggest a few steps to help troubleshoot your iPhone speaker. These steps are from the following support article: If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

1. "Remove all screen protectors, films, or cases from your device. 
2. Check the speaker opening to see if it's blocked or dirty. On iPhone only, make sure that the receiver isn't blocked or dirty. 
3. If necessary, clean the speaker or receiver opening with a small, soft-bristled brush. Make sure that the brush is clean and dry.
4. Go to Settings > Sounds (or Settings > Sounds & Haptics), and drag the Ringer and Alerts slider back and forth a few times. If you don't hear any sound, or if your speaker button on the Ringer and Alerts slider is dimmed, your speaker might need service.
5. If you hear sound, try making a call with your iPhone and turn on speakerphone. On iPad or iPod touch, make a FaceTime call. If you still can't hear, or hear static or crackling, then your network or reception could be the issue. Try to call again later, or from a different location."

If you try those steps and still experience the same issue, we recommend reaching out to Apple Support directly for assistance. You can reach them here: Get Support

Take care.

Try this quick fixes

Speaker test: Use the Accessibility settings' "Audio/Visual" toggle to play a test tone and isolate the affected speaker.

Software updates: Check for and install any pending iOS or app updates, as outdated versions can cause issues.

Restart: Sometimes a fresh start fixes glitches.

If that doesn't work check detalied guide on iphone speaker not working.