Tricks Tricks:
I was hoping the blackphone would take off and be good enough, but no luck. Soon I hope a company comes out with a really well done OS that's locked down properly, but I'm not holding my breath.
Blackberry OS 10 was such an os, but newer phones dumped it for Android.
I still have my Z30, and they can pry it from my cold, dead hand. My work phone is also BB, but Android.
I turn it on when I arrive at work, and turn it off before I hit the elevator.
I've got an android and my placement for a pentesting company will be an iphone.
There are custom roms that lock down android fully, but it almost makes the phone unusable. So we'd have to get to the point where we can dual boot, or atleast good dual profile.