On: Driver caught using cell phone jamming device

[msoad]

I don't know if you noticed this but in my area most of retail stores have terrible cellphone reception. I'm assuming they put cell jammers in their store too

[colinbartlett → msoad]

That's a pretty unsubstantiated assumption. Could it simply be that cell signals have trouble penetrating the store walls?

[thisone → msoad]

I think it might be the fact that it's a rather large concrete box with very few areas that signal can pass through.

[mahart → msoad]

There are building materials that naturally block/reflect/absorb mobile frequencies which is perfectly legal.

That is different from transmitting a signal to jam which is highly illegal.

[dingaling → mahart]

One other trick is to advertise as a cell and accept connections, then just black-hole them.

Full signal strength but no calls.

Edit: may be illegal in your jurisdiction if you require a license to transmit on cell frequencies.