The mobile phone is a great invention! But sometimes, some people may abuse/abuse wonderful inventions. This is why we have network security (for example). But what about cell phones? Can we block cell phone signals in certain locations to prevent unnecessary cell phone calls? Yes, we can do this-with a cell phone jammer!
Mobile phones basically use radio frequency signals in a specific frequency range to transmit voice/data through wireless media in order to communicate with other mobile phones. These signals are coordinated by cell towers in the area covered by mobile phones.
In most cases, mobile phones use one frequency to send signals and another frequency to receive signals. The frequencies used by major telecommunication standards such as GSM, CDMA, 3G/4G, DCS, PHS, etc. are fixed and large areas. Therefore, by sending a high-power RF signal that needs to be blocked in the same range as the mobile phone communication signal, shielding may occur in the mobile phone communication (in a specific area).
To do this, people may need a small device called a'phone jammer' (with a transmitter, antenna and other electronic circuits). When someone turns on this device, high-power radio frequency signals are generated and sent out (within a certain coverage area), thereby shielding the true cellular voice/data signals, thereby effectively blocking/interrupting them.