From Jim H
If you have a smartphone, here's a tip that might be useful...Jim
Fix your phone’s call audio
Let’s say you’re on the phone with a pal, and your background is so noisy that your friend can’t hear you. Good news if you have an iPhone: There’s Voice Isolation mode.
Place your call, and when your recipient picks up, swipe down from the top right of your screen to access the Control Center.
At the top of your screen, you should see an orange microphone icon next to the word Phone. Tap that, and you’ll see a separate screen with an Audio & Video option. Scroll to and tap Voice Isolation.
On a Samsung, open Settings > Sounds and vibration > Sound quality and effects.
Here, you’ll see Adapt sound.
Have a Google Pixel? Go to Settings > Sound & vibration > Clear calling.