Hi Jacob5976,
Thanks for using Apple Support Communities. We understand you are experiencing an issue with calls when using Speaker Phone. To start, clear the microphone to ensure nothing is blocking it:
1. Remove any screen protectors, films, or cases from your iPhone.
2. Clear any debris from the openings of your iPhone.
We also recommend working through the steps below to determine if this is an issue with phone calls, or related to microphone:
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.
See more about what to do when the microphones on your device aren't working as expected here: If the microphones on your iPhone aren't working - Apple Support
If the sounds in the video isn't clear, reach for further support here: Apple Support
Thanks.