Learn more about signal jammers
Jamming mobile phones is like jamming any other type of radio communication.
A mobile phone communicates with its service network through a base station. As the phone user drives down the street, the signal switches from one base station to another.
Different communication systems use different frequencies so that everyone is at peace.
The basic principle of cell phone jamming devices is to emit the same radio frequency signals as cell phones. Because of the same frequency, the phone can't tell which signal is the regular base station signal, thus achieving "interference". As long as there is a machine with the same frequency as the phone, it makes a lot of "noise" when the base station tries to connect to the phone. You will find that the signal from the phone is unrecognized, so you will refuse to communicate with the phone.
In the early days, signal jammer blocked only one set of frequencies, such as 2G, while complex jammers could block several types of networks at once, such as two-three-four G.
Once again, jammers have evolved to add bluetooth and wifi bands to the scanning range, leaving several forms of communication common in society completely covered.
Most people don't understand the difference between bluetooth, wi-fi and mobile data. It seems to be wireless communication technology, but the main difference between them is frequency band. In the mobile communication technology, 2G mainly works in the band of 900-1700mhz, 3G works in the band of 1900-2100mhz, and 4G works in the band of 2300-2500mhz. Bluetooth and WiFi work in 2.4GHz.
At present, the main principle of signal shielding and cell phone jammer is to emit huge noise in the frequency band used by mobile phones, interfering with the reception and transmission of normal signals of mobile phones. The gadget is often used not only to prevent cheating on exams, but also to prevent terrorist attacks, politically and militarily. But a signal jammer is not like a grocery store. It's not something you buy and use casually.