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Sharp edges for the kids to run into! Thanks!
Sealing the inside of your smartphone with foil with block the signals as well as trap the heat generated by the battery, baking your phone like a DiGiorno pizza.
Sealing the inside of your smartphone with foil will not only prevent signals from reaching it, it will insulate the heat generated by the battery and bake it like a DiGiorno pizza.
Simple and cheap indoor TV antenna