Why do prisons need cell phone jamming devices?

The DIG further said the technical team would also visit Cuddalore and Coimbatore central prisons in the coming week to install jammers there. “Since the notorious criminals, fundamentalists, LTEE and Naxals are lodged in the central prisons in Vellore, Coimbatore and Cuddalore, the department is taking measures to install cell phone jammer in these prisons soon,” he added.

Cellphone jammers are also a necessity in prisons. Authorities have confiscated more than 6,000 cellphones in North Carolina’s 55 prisons since 2005, including 443 so far this year. The numbers rose steadily until 2012, when authorities implemented airport-like entrance and exit procedures, such as metal detectors, X-ray scanners and trained dogs, at higher-security prisons. A state law passed after Janssen’s kidnapping that made it a felony to provide a cellphone to a prison inmate also served as a deterrent, authorities said. Some facilities used “managed access,” an expensive system that blocks unauthorized cell signals, in portions of the prison, but Solomon said signal jamming would extend that across entire prisons and be more effective.

While the U.S. military is unlikely to intentionally attack Russian forces in Syria, the situation highlights the importance of suppressing enemy air defenses—one major tactic U.S. flyers have long relied upon is radar jamming, or saturating enemy radars with “noise” and false signals so that they can’t track and fire upon friendly airplanes. The U.S. Navy has relied on the ALQ-99 jamming system for nearly half a century, even as opposing radars grew in ability. However, by the beginning of the next decade it will begin fielding the superior Next Generation Jammer, boasting significant electronic-attack and signal-intelligence capabilities.

So should schools use cell phones to jam devices?

Some believe that teaching kids not to use phones in class is simply a matter of teaching them respect. But when they see their parents using them at the dinner table, walking down the street and even driving, what are kids supposed to think?

Anyway, we can see that most people support teachers using signal jammer. Cell phone jammer block most types of signals, effectively preventing students from cheating, using cell phones in class, etc. Therefore, the rational use of jammers is not a bad thing.