I done a software update two weeks ago and noticed stright after incall volume now has half its normal volume.
Tried every setting but can't turn it up.
Just wondering did you also do update.?
Thinking Samsung are deliberately messing up so public buy new s10 etc.
My s9 lost incall volume by about 60% straight after a update. Tried cleaning speakers with fine brush which to be fair did slightly improve.
But volume came back 100% two weeks later after yet another update.
Not sure what's going on with my s9
Could be software or a malfunctioning speaker....working great a the moment.
Hi! I have been trying different Apps and it hasn't helped. I tried this and it helped my in-call volume... maybe it will help you.. I own a Samsung Galaxy S9 Plus. It has to do with the MONO Audio! Go to Settings, Accessibility, then Hearing enhancements, then Mono Audio. .... https://forum.xda-developers.com/pixel/help/low-call-volume-update-t3792377