I'm pretty sure the military has equipment that does this and I know you can buy cell phone jammers that block cell reception. The idea is you create a spot in a city some place where you create a blackhole of Wi-Fi, cell and radio transmission. You could set the spot up as the anti-tech cafe, where you could meet without the stress of cell phones going off. It would be a silent spot in a world of noise.
Even better than that you could create a blackhole of reception in a movie theater. Then you wouldn't have to play those "turn off your cell phone" previews. You would just know that even that dummy that forgot to turn off his cell isn't going to be getting any calls during the movie anyway.
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