Chosen Solution
I was replacing the screen to my s9+ and as such had to put all of the old pieces over to the new screen, but I was wondering why the phone calls sound so quiet. Speaker phone is fine but the ear piece for non-speaker phone is noticeably quite. Did I put the ear piece in backwards if thats even possible?
You can’t put the speaker in backwards. Did you check and see if there was any blocking of the opening for the speaker. I have gotten screens before that had plastic protecting film. You could also check the connections and make sure they are not damaged and they are clean and tight.
