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…
@DF5RE @drew_belloc @noodlejetski The ARM build of the flatpak is listed here: https://linuxphoneapps.org/apps/org.signal.signal/
@opensourceopenmind @drew_belloc @noodlejetski Great, thanks for the hint!