Do you know the specific reasons for installing jammers in the prison?

The judiciary poses huge problems for smuggling, not only because of the high number of undisclosed and undetected devices. Stolp said: "Mobile phones are a security risk because they cannot control the prisoner's contact with the outside world." For example, prisoners can use the phone to influence witnesses in court proceedings, make escape plans with people outside the organization, or organize drug deals.

The investigation revealed that British prisons are facing a crisis caused by thousands of smuggled mobile phones. From the evolving criminal empire outside the prison wall to intimidating and ordering drugs in them, they all have various drawbacks. Now, prison officials are calling for a tougher attitude toward this "cancer", including the use of human interference to stop calls. After the banquet and drug party and recording the bare ankle, it has been repeatedly falling behind.

Hidden in a fish tank, thrown on a wall at night or smuggled by a lawyer-mobile phones are increasingly being illegally taken to five prisons in Mecklenburg-West Pomerania. In 2014, 408 smartphones and cell phones were seized during the control period. In the first half of this year, there were 158 mobile devices.

Five years ago, the Baden-Württemberg prison in Offenburg was the first prison in Germany to install a mobile phone transmitter. To avoid interference with mobile phones outside the correctional facility, 700 small interference transmitters were installed throughout the hotel. Cost: about one million euros.

The portable jammer socket card was identified as the planned government equipment intended to curb the use of cellular phones. It takes three to four weeks to install the antenna, and users including the 3G and 4G frequency bands will not be affected by signal interference. These devices work by sending their own radio signals to encrypt transmissions in specific areas. This technology can be used in conjunction with trackers that can identify individual phones that are blocked.