There are some apps out there that enable more fine - grained volume control and there's also a build.prop method to edit
the media volume steps, but neither solution is perfect.
The OnePlus 5 is certainly the first phone I've ever noticed to have more than the default 15
media volume steps.
From there, go to «Change step volume» and use the slider to increase the number of
media volume steps.
By default, the Galaxy S9 and S9 + only have 15
media volume steps — in other words, there are only 15 increments between silent and full volume.
Not exact matches
Fortunately, there's a simple way to add more
steps to your call or
media volume that doesn't require the Xposed Framework and works on Android 6.0 + as well.