GSM jamming equipment is becoming a civil product

A cell phone jammer is a device that blocks the transmission and reception of radio frequency by a cell phone with a base station. When in use, gsm jammer effectively disables cellular activity between the base station and the device by creating a temporary "dead zone" for all immediately adjacent cell phone traffic. Cell phone jammers were originally developed for law enforcement and the military to interrupt communications for enemies, criminals, and terrorists.
Some are also designed to outsmart the use of certain remotely detonated explosives. Civilian applications were evident, so over time many companies initially contracted to design jammers for government use turned to selling these devices to private entities. Since then, their purchase and use have been increasing slowly but steadily, especially in major metropolitan areas.