I think I found my own answer here:
https://www.androidauthority.com/pho...lained-744100/
And if I understand it, that is a lot of stuff you can't see unless you unlock and root a android phone.
This page is not encouraging as far as seeing much more:
https://www.androidcentral.com/root#F
It says there that ".. all the U.S. versions of the Galaxy S9 are locked up and encrypted..."
Jack