Comment by hunter-gatherer

I came here to say what you did. I used to work in three letter agencies and took part in testing faraday bags for clandestine operators. Something about faraday bags that most people don't know is that they have a shorter life than you would think. As they move around and bend, they start to "leak" more RF. WaitWaitWha is also correct that in a pinch, some aluminum foil works pretty well if you're careful. The service will be so bad, that the phone won't likely get packets out or in. Just be thorough when doing it.

Also, I worked with clandestine people and for most of them had threat models more relaxed than a lot of people on HN. What are you all up to???