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…
3/5 and as I was writing this I found out I might be able to get rid of the video recording shortcut because apparently a software update exposed the full video resolution to OpenCamera… although I still have to test that.