Some cell phone jammer have powerful capabilities, capable of shielding 2G 3G 4G mobile phones working through the following radio frequencies: CDMA (851MHz-894MHz), GSM (925MHz-960MHz), DCS (1805MHZ-1880MHz, PCS (1930MHz- 1990MHz), 3G (2110MHz-2185MHz), 4GLTE) 725-785MHZ, 4G (Wimax) 2300-2410MHZ. It is a device designed to prevent radio equipment from receiving and transmitting signals (mobile phones and base stations).
The 3G 4G mobile phone signal jammer disables those phones located in the range of action by sending signals on the frequencies where GSM and UMTS operations are performed to make or receive calls and messages.
The background of mobile phone shielding devices: in various examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, military power and other occasions, we are prohibited Those who use mobile phones are prohibited from using mobile phones in the above occasions. However, in the above occasions, the mobile phone will be turned on and brought in if you are not paying attention. Therefore, a technology is urgently needed to shield the mobile phone without affecting the use of other electronic products. , Mobile phone jammer came into being.
