floreen

I would suggest Pixel 8 series or later, since they get 7 years (instead of 5) of updates, which is also decisive for Graphene support duration.

Yes, but mostly with CoronaVac and Sinopharm vaccines which apparently are not very effective against Omicron.

Signal has reproducible builds for at least Android: https://github.com/signalapp/Signal-Android/tree/master/repr...

You compare the result you get compiling the app yourself with what you downloaded from the Play Store. For iOS this might be harder