[BorisMelnik]

For most of his work, he is probably using a PC without a video camera (webcam / mic) operating under a fake identity. Good chance he is just using a normal OS / setup.

Phone, I agree he probably has to have some sort of blackphone unless he is altering his voice.

Now, when he goes to communicate with his family / reporters I'm sure he has a whole setup with Tor / Tails and a whole lotta encryption.

If you watched the recent documentary you will see he did a lot of command line stuff and was a huge advocate of PGP.