What is a cell phone jammer used for?
Cell phone scrambler can be used in places like hospitals, churches, movie theatres and other places with performances, and other buildings where and when the use of mobile telephones may result in a leak of sensitive information: on such occasions, jammers are legal as long as their operation doesn’t interfere with electronic medical equipment (such as pace-makers) and allows mobile phones to make emergency calls. Tri-Band Jammers are reserved to, and in use with, the police forces and are being experimented in prisons.
Of course, many education institutions and private companies will also buy the equipment. For example, prevent students from using mobile phones during class. Or prevent employees from using their mobile phones at work.