The "Mobile Settings" app was a bit confusing when I first tried to use it.
It just showed me a more-or-less blank screen.
Eventually, when I swiped on the screen, it took me to a menu.
I think it should have shown me the menu immediately. (What was the point of the blank screen from a user-experience (UX) point of view.)
But, either way, I got it working. And, tweaked some things.