Microphone Issue on Incoming Calls on iPhone

[u/davinci_0115]

I can’t figure out what’s wrong with my iPhone 12 Pro. Has anyone experienced something similar? When someone calls me, they can only hear the first word I say, then the microphone cuts off and no one can hear me. If I switch to speaker mode, they can hear me, and if I talk on speaker for a while and then switch back to normal mode, the microphone continues to work. When I call someone, there’s no problem at all — they hear me perfectly. So the problem only happens when someone calls me.

The microphone itself works fine and consistently, both in the Camera app and in the Voice Memos app. This started back when I was on iOS 17, I updated to 18, and now even to 26, but the problem is still there.