Cell phone signal jammer device first appeared in the market late last century when these products were being sold to other oil and petrochemical companies to prevent the phone from being turned on if the hazard was caused by a spark. Later it gradually turned to theaters, exam halls, libraries and other places where the interference with cell phones must be avoided.
According to the principle of operation of the device, there is such a professional description: "The principle of the mobile phone is in a certain frequency range, the mobile phone and base station are connected by radio waves, in a certain way of baud rate and full data and voice transmission Communication principle, the phone mask is at a certain speed at the lower end of the channel up to the high-end scan. The speed of the scan can be used to signal interference in the recipient's message so that the phone can receive normal data from the Base station not recognized and no connection to the base station can be established.
