It isn't always the stuff from Hollywood. If you have ever seen the movie Enemy of the State, but there is a scene where Gene Hackman takes Will Smith's cell phone and puts it in a foil lined potato chip bag to block the cell phone signal. Surprise, surprise, but it actually works. In the real world, Ars Technica reported that a 60-year-old electrician in Perth, Western Australia (Tom Colella) put his employer-provided personnel digital assistant in mylar and foil snack bags in order to stop the GPS tracking. Apparently, he would do this when he wanted to play a round of golf and did so 140 times. His employer was not amused. His employment was terminated because it actually worked.
We use Faraday bags and have a Faraday box to block cellular signals when we deal with mobile device forensics in our lab. I don't think our clients would appreciate Cheetos crumbs on their cell phones so we'll stick with the Faraday box.
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Digital Forensics/Information Security/Information Technology