A cell phone 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.
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There's no question that in most offices, email and the Internet are absolute necessities. But are cell phones? In a survey by Pew Research, only 24 percent of adults with full- or part-time jobs listed a cell or smartphone as "very important" to getting their work done. In other research, 50 percent of bosses think a cell phone is a negative to workplace productivity.
There are plenty of places where it's actively dangerous to be using a cell phone—but the devices are probably snuck on to warehouse or assembly line floors all the time. If employers could jam signals but allow for emergency calls, no harm, no foul.