Cell phone signal jammers are very useful devices in some specific locations, such as prisons and events that do not allow signal interference — such as high air traffic zones or presidential inaugurations, for example. In general, the operation of these devices is relatively easy to understand, as we explain in the lines below.
Signal jamming jams frequencies used for communication
Simply put, jammers are able to emit a very strong frequency signal to “congest” the spectrum that is usually used by mobile networks. In this way, cell phones are without signal and incommunicable within the device’s area of operation – something similar to what is done in a more focused way in “weapons against drone”.
Even though the main use of jammers is to prevent communication between inmates, they can also be used in other places. Determinations approved by Anatel in early 2023 allow them to also operate in ports and airports, public safety areas and more.
In any case, the use of the choke usually involves a fair amount of planning to ensure that it does no more harm than good. If it is not well adjusted, the product can disturb residents neighboring the prisons, for example.
For this reason, specialists make a detailed study of the environments, and install an emission system within this location, with several points — almost like a Mesh network, but with opposite objectives.
In addition to the signal from internet connections, the equipment can also interfere with GPS, Wi-Fi and radar signals from security authorities. Therefore, its use is quite restricted.
Currently, signal jammers cannot be used by individuals or companies. In addition, their use without Anatel’s authorization constitutes “clandestine telecommunications activity”, with a penalty ranging from two to four years in prison.
Interestingly, the legislation is not as strict in some other countries. In France, for example, jammers can be used in places like cinemas, concert halls or other venues where shows take place — all to ensure that audiences don’t get distracted on their smartphones or disrupt the presentation with unwanted calls.
Source: Technoblog, G1, Spy Market
