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How to make a cell phone dead zone box? Answered

To test an application under conditions where the carrier's signal drops (someone driving into a tunnel for instance), I'm curious if there's some sort of box available (or easy enough to make) that I could put the phone into and close it, effectively blocking out the carrier's signal and dropping the call.

Thoughts anyone? Thanks! -Chris

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(Otherwise known as a switched-off microwave oven...)

A box with Alluminium foil inside.