Muffled speaker on my iPhone

Hello Plaincitygal,

We would like to see how we can help you with your iPhone microphone not working as expected. Follow the steps in this link and let us know if you have any questions: If the microphones on your iPhone aren't working - Apple Support

"Clear the microphones

1. Remove any screen protectors, films, or cases from your iPhone.
2. Clear any debris from the openings of your iPhone. 

If people can't hear you when you're using speakerphone 

1. Open the Camera app.
2. Record a video while speaking at the top of your iPhone.
3. Tap the camera chooser  to switch to the other camera. Then record another video while speaking at the top of your iPhone.
4. When you play back the videos, you should hear your voice clearly."

Cheers!