I have an intermittent issue happening with my iphone 8 plus.
When I make calls, I can barely hear the person I'm talking to--even with the volume on it's highest setting.
I am not connected to bluetooth when this happens. There's no damage to my device. And my device is in an Otterbox Defender case. Issue happens when the case is on and off.
I'm so sorry to hear that you are having trouble with the speaker on your iPhone 8! You mentioned that this is intermittent. Do you notice if it happens when talking to specific people, or when you are in a certain location? How often does it occur?
SAMTAY78, thanks for those details. I want to make sure you have a working device. Have you done a Erase All Content and Settings on your phone? When was the last time you backed up your personal content?