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Having a Faraday cage is a good idea if you are preparing, A Faraday cage protects electronics from EMP (Electro magnetic Pulse). EMP’s can be detrimental to society, if an EMP were to hit near you all of your electronic devices would be fried.
You can make Faraday cages as big as you like but a small DIY project to keep cell phones and small electronic devices in is always goof to have in the house. Survival mom shows us how to make one for cheap below. This is a great article and would recommend bookmarking.