Kits are already easy to buy. People don't bother buying the kits because if you use the jammer generally you are found. Occasionally pops up in the news.
Fair point, I don't know how these issues are addressed with the current technology .. but I do know, these jammers are out there and can be deployed by those who want a cell-phone free environment. Every location that I've seen them in has a big sign, usually, on the front door that says "YOUR CELL PHONE WILL NOT WORK IN HERE", or something to that effect .. its up to the owner of the technology to work out what to do in that case, I guess.
Very. Jammers would also block emergency calls, which is pretty serious. Imagine the lawsuit when a kid has, say, a diabetic episode and the 911 call was blocked by a teacher's jammer.
If everyone agrees that cell phones in prisons are a bad thing, when why not use jammers to stop the signal? A small cell phone jammer can be gotten for ~$130, and it probably wouldn't take many to blanket a prison. This would lead to issues with communication between the inside and outside, of course, but a mixture of land lines and VOIP would make it pretty easy for guards to continue as normal.
A friend of mine used to rant about cellphones in theaters, and thought theaters should install jammers (as in, he was actually surprised that none had done this yet). The fact is, they're a primary communication device for many people. Who knows when you might receive a call that you have to take (for certain jobs or with situations concerning family or friends), or when you need to make a phone call (see the Aurora shooting or the recent one in FL for violent examples, but even a heart attack or some other medical emergency). Jammers just aren't a good idea for 99.999% of the situations people suggest using them.
As tgsovlerkhgsel said, they're not the classic style of jammer. That kind of thing is called a "smart jammer". And if you built that exact kind of functionality into a device and sold it (vs. just allowing the customer to code it themselves, like they could on any wifi device), you are probably committing a felony by manufacturing and selling a signal jammer.
They are easy to jam if you don't mind also not having GPS, Wifi and 3G/4G/5G service. You can do selective jamming but this is much more sophisticated
I’d just show up with a large cell jammer on the roof of my logging truck. Probably cheaper than continuously modifying the sound of trucks and chainsaws?
Until of course they’re using decent newer phones that can do edge inference
Cell phone signals can be jammed fairly easily. It's illegal to do-so in the states, but the devices are pretty easily obtained from what I've read. I'd imagine even easier in other countries.
A very popular Chinese online shopping site has $50 GSM/WCDMA/HSDPA/LTE jammers that fit into your pocket and they offer free shipping all over the world. I imagine that getting one sent to the US would be very easy and since only 1% of all parcels are opened for inspection it would be unlikely to be ever found out.
Signal jammer sounds far away from our living life? No! Mobile phone signal jammers are widely used in our daily life where silence is expected or information security in needed. In some conferences, cinema, theater, examination room etc, mobile phone jammers are used secretly. But general people think the jammer is used in police office or some necessary place and with a high price. Indeed, fact is not like this, common jammer is cheap and has a high efficiency in a not big space.
This is much better than phone jammers, which some venues tried about a decade ago. The FCC and telcos have been reasonably successful at stopping that.[1] Many (most?) cell phone sites now detect and report interference, so jammers get noticed quickly.[2]
The company that does this will probably lose a few percent of their cases per use, but, like 3D glasses, most people will return them at the drop-off bins.
While jamming is criminal behavior, the fcc won't be able to find you, in fact, the FCC have yet to even prosecute a single person for cell phone jamming since it's very hard to find and it's very easy hide jammers because people just think they're in a dead zone or their phone is malfunctioning
Theoretically, it is possible to triangulate the jamming signal by pinging cell phones and finding which ones aren't in the dark, mapping it to find the guy but it could take hours and the damage would have already been done.
oh, and sales of jammers have been going on for years on craigslist, I'm surprised they've just shut it down this year.
A government - or even just a sufficiently motivated individual - can trivially jam all phone, wifi, bluetooth etc communication.
Or they could just 'listen in' to record the signatures of all detected phones, so they can work out and identify who is in the crowd etc.
Military systems use frequency hopping etc and would be a more difficult target. But doubtless motivated governments could hamper their use in crowds too. Here's a fun comment I just found when I googled that: https://www.quora.com/Is-noise-jamming-an-AESA-radar-possibl...
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