Hi everyone

Hi everyone.
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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I need you, to tell your mom how much of a faggot you turned out to be, at that she should have eaten the load instead

Delete this thread or prepare for a literal "shit" storm my friend

Why? I'm just asking...

Just learn how to make a faraday cage and viola.

Yes, there are such devices, but they are illegal, and having one with you would land you some serious trouble.
It's a pretty simple device: it just needs to spam noise in a couple frequencies.
What do you need it for?
If you consider the risk worh it (and it's a pretty big risk! they are detected as soon as you turn them up...), probably the best way of getting one would be buying any software-defined-radio device, and doing some coding.

All you need to do is fill your pockers with rancid dog shit and people around you will lose their need to use phones

cell phone jammers exist. theyre expensive and illegal in many countries. at the height of pokemon go, a local business owner put one in the bushes after people kept trashing his patio. got busted, went to jail for a few days and got a huge fine. i hope its worth it for what youre doing.

I will use it for work, i need to block phone signals in an isolated building.
Ok so buying is not an option i guess. So I will need to spam the frequencies on that the smartphones operate. It will block calls both incoming and receiving?
It's going to be used in an isolated place, not in cities, how they will detect it?
Of course a faraday cage is not an option.