Brazilian prisons have long been troubled by the secret use of mobile phones by prisoners. Now, the signal jammer developed by Israel has helped. The device sells for about 520,000 reals in Brazil, and its size is similar to a laptop with an antenna and GPS tracking system. When a prisoner is in jail, using a cell phone, cell phone number, service provider and SIM card content and other information are displayed on the screen of the instrument, not only the cell phone call will be automatically interrupted, but the location of law enforcement agencies will also lock the prisoner.
Mobile phone signal jammer is a special device, suitable for special departments and special places. In recent years, mobile phone screening equipment has been used for civilian manufacturing, and some schools have been used as a means of preventing fraud or installing in public places such as gas stations, conference rooms, theaters and hospitals.
