With the rapid development of smartphones and the Internet, mobile phones are becoming increasingly important in our lives. However, this convenience also brings a lot of trouble, especially in highly guarded places such as prisons. Prisoners using mobile phones for illegal activities has become a global problem. To solve this problem, many prisons have begun to introduce smartphone jammers. signal jammerThis article will explore the application of this technology and the challenges it faces.

　　The threat of smartphones in prisons

　　Prisoners in prisons obtain mobile phones in various ways and use them for illegal activities. Mobile phones allow prisoners to stay in touch with the outside world, direct crimes, plan escapes, and even extort money. In recent years, some prisoners in Delhi Jail have used applications such as WhatsApp to make video calls to intimidate and extort the outside world. For example, a businessman was asked to pay a huge ransom after receiving a threatening call from a prisoner. These incidents not only pose a threat to social security, but also pose a serious challenge to prison management.cell phone jammer

　　How mobile phone jammers work

　　Mobile phone jammers interfere with the communication signals between mobile phones and base stations by emitting strong electromagnetic waves, making mobile phones unable to work properly. GPS jammer In this way, even if prisoners have mobile phones, they cannot make calls or access the Internet. The jail administration in New Delhi has started introducing these devices to curb illegal activities by prisoners. Sandeep Goel said last month that stopping prisoners from using mobile phones was one of his top priorities.

　　Technology upgrade from 3G to 4G

　　As mobile communication technology develops, prisoners have started using 4G SIM cards for communication, and traditional 3G jammers have gradually lost their effectiveness. In response to this change, the jail administration decided to upgrade the jammers to block 4G signals. The upgrade enables the jammers to more effectively prevent prisoners from using new communication methods such as VoIP.

　　Challenges of wireless networks

　　Despite the upgrade of the jammers, prisoners in the jail are still able to communicate through wireless networks. Some prisoners use WiFi to make calls in the jail, circumventing the shielding of traditional jammers. To address this problem, the jail administration plans to install WiFi jammers in more jails to completely cut off prisoners' communication channels.

　　Influx of illegal devices

　　The jail administration also faces the problem of influx of illegal devices. Some prisoners' accomplices smuggle mobile phones and other communication devices into the jail through various means. For example, an employee of a criminal hid the parts of a mobile phone in a rubber ball and threw it into the jail. These devices were collected and assembled by prisoners for illegal communications.