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Three people recently asked me about Faraday cages (to prevent their phones from being tracked), probably because of this blog post from a few years ago: https://www.mattblaze.org/blog/faraday/

Tl;dr:

- You probably don't need a Faraday cage. If you need to use your phone or have it on to receive calls/texts, a Faraday cage won't help you!

- The main use of a Faraday cage is to provide *assurance* that your phone is really off and not broadcasting your location.

- If you *do* need one, get a good one.