I teach in a county where kids are allowed to have cell phones. They aren't suppossed to turn them on, but they do. I want to scramble the signal at least in my room. Any cheap way to do this?
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I teach in a county where kids are allowed to have cell phones. They aren't suppossed to turn them on, but they do. I want to scramble the signal at least in my room. Any cheap way to do this?