Callers complain about poor sound
I bought 8+ and it has a muffled voice. People in the other end constantly ask me to speak louder or complain that they can’t hear me. They say that it seems I am calling them sitting in a tunnel. Some people on the other end said that I was “breaking up” and sounded like I was underwater. Turning the speaker phone helps a bit but the voice quality still suffers.
Some suggested it may be because of Freedom Mobile Network issues. I switched to Fido but the problem persists.
This phone was bought from local Apple store back in October, 2017.
Can any body suggest a solution? I read on Google that many other users are having the same issue with their iPhone 8s.
iPhone 8 Plus, iOS 11.2.5