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Smartphone jammer

1 Name: Anonymous 2020-04-20 12:41
Hey guys

I was wondering if there is a device to jam smartphone frequencies available to buy. I don't need it to affect the phone, i just need to block the connection. Ideally it will be portable or 12v and with a range of at least 30m. I need it to work 100% of the cases, even through a few walls.

Does anyone know a device? Or how to build it?

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