Go to your phone homescreen and look at the app dock (the bottom row that contains some apps and stays the same when you switch pages).
Which are yours? Any FOSS apps?
In my case, they are FDroid, Signal, Threema, Firefox and the defaul Samsung camera app. So, 80% FOSS…
I don’t have a fixed bottom row.
I’ve got maximum two pages. Folder Cover mode is much more efficient. (I hope for an immersive (full screen) mode some day)
What’s not foss? banking, gov broadcasters, arte, ard, zdf, german train app, magic earth, ebay, dict.cc, car sharing,