The OP should change his paradigm. Each and every one of us is a dissident who will be tortured and murdered along with our families if either governments or corporations can figure out who we are.
He should start from there. THAT is who he is building a phone for simply because that is how private all phones should be. If you actually got yourself into that kind of trouble, say in Iran or some other dangerous place, your phone should not betray you. It should be something you can rely on when the chips are WAY down.