Free Your Android
I think this whole exercise gives you a false sense of security. The thing is, there's a closed-source firmware running on the baseband processor which can do rather nefarious things: <a href="https://www.fsf.org/blogs/community/replicant-developers-find-and-close-samsung-galaxy-backdoor" rel="nofollow">https://www.fsf.org/blogs/community/replicant-developers-fin...</a><p>So if you really want to be 'free', get rid of the cellphone.