Hello PleaseHelpAdam and welcome to Apple Support Communities.
It appears you are having some difficulty with echo when on phone calls. We will be happy to check this out with you.
Check for any carrier settings updates for your iPhone: Update your carrier settings on your iPhone or iPad - Apple Support
If you still have issues, please try these steps testing after each step:
1. Ensure the iPhone is running the latest version of iOS, 14.3: Update your iPhone, iPad, or iPod touch - Apple Support
2. Restart the iPhone. iPhone User Guide: Restart iPhone - Apple Support
3. Reset your AirPods: Reset your AirPods - Apple Support
4. Ensure the AirPods are full charged. Charge your AirPods and learn about battery life - Apple Support
5. Remove any case from the iPhone.
6. Disable Wi-Fi in Settings (not Control Center).
7. Disable Wi-Fi Calling in Settings > Phone.
8. Disable VoLTE in Settings > Cellular > Cellular Data Options.
9. Disable Cellular Data in Settings > Cellular.
10. Forget the accessory in Settings > Bluetooth > [accessory name] > Forget This Device, and then set it up again.
11. Forget every Bluetooth accessory (including an Apple Watch) other than the one you're testing with in Settings > Bluetooth.
12. Determine if the issue is isolated to a specific location. If so, isolate away from potential sources of interference. Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
Cheers.
