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Signal Jammer THE 8 MOST ASKED QUESTIONS ABOUT SIGNAL JAMMERS: WHAT IS IT? What is a cell phone signal jammer? A mobile phone signal jammer ;is a device that blocks reception between cell towers and mobile phones. Developed for use by the military and law enforcement, these devices were originally created to combat threats like cell phone-triggered explosives and hostage situations. How do cell phone signal jammers work? Known as cell jammers, signal bl ...Read More