What is a mobile phone signal jammer?

A good cell phone jammer device can effectively block all types of cell phone signals, including GSM, 3G, 4G, CDMA, WIFI, GPS and PHS. Using the same frequency as the mobile phone, the mobile phone jammer will strongly interfere with the communication between the caller and the receiver, thereby cutting off the normal communication between the mobile phone and its nearby base stations. The mobile cell phone jammer is to prevent the normal use of mobile phones. It prohibits the use of mobile phones by reducing the frequency of mobile phones and cell tower base stations, and loses the ability to call and send information within the effective frequency range. People within the interference distance will not be disturbed by loud calls and maintain a calm mind. Finally, signal jammers can be used in meeting rooms, auditoriums, courts, libraries, examination rooms, schools, cinemas, theaters, hospitals and other places where the use of telephones is prohibited.