Iphone 11 pro: Other party cannot hear my voice in calls

Hi,

I have iphone 11 pro, since long time I am facing the problem that when I make a voice call then other party cannot hear my voice properly and its breaking a lot.

I tried to switch to wifi and make whatsapp call, and still issue persist. So for sure it is not the carrier operator issue.

I tried restart, switched from airplane mode etc and still problem does not resolve.

When I try the call from iphone 8, then problem does not surface.

I will really appreciate if you can do something.

Thanks!