There's no sound on calls
When answering calls, I can’t hear the person on the other line as well as they can’t hear me. My speaker button is greyed out also. I can only answer calls using AirPods/earphones. My speakers work just fine if I’m watching YouTube or Netflix. But when someone calls I can answer but they can’t hear me. How can I fix this?
[Re-Titled by Moderator]
iPhone 7 Plus, iOS 15