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At present, it is illegal for personal use of cell phone jamming device. Do you know where it is legal to use cell phone jamming device? Anyone caught manufacturing, selling, owning, or using a mobile phone jammer in the U.S. is punishable by an $11,000 fine and up to a year in prison for each offense.

In the U.S. the FCC (Federal Communications Commission) makes certain frequencies available to broadcasters for public use. When an end-user pays to use that spectrum, jamming the signal is paramount to 'property theft.' The FCC is also concerned about potential "leakage" — of jammers interfering with frequencies outside the range of cell phones, like garage door openers or medical equipment; and it's worth noting that over 100,000 emergency calls are made each day from cell phones.  

Proprietors of many kinds of businesses would like to use cell phone jammer. Restaurant owners and theater houses are just two examples of places that regularly receive complaints from patrons over cell phone abuse. Short of providing expensive metal shielding in the construction of the buildings to block cell phone signals, (which is legal), it's understandable that placing an inexpensive mobile phone blocker in the back office to surreptitiously block cell phone usage in the establishment might be tempting. Hospitals would also like to jam cell phones which can interfere with medical equipment. Churches, libraries, courthouses and business owners that want to boost employee productivity are all examples of potential customers of cell jamming technologies.

Mobile phone blocking device can be useful around a Presidential motorcade, for example, to keep terrorists from detonating a bomb from miles away or even from outside the country. By wiring a cell phone to explosives the device can be triggered by simply placing a call to the phone, as was done in May 2002 by Palestinian militants in Tel Aviv when they targeted an Israeli fuel depot by rigging one of its fuel trucks.

Law enforcement also uses a cell phone signal jammer in hostage situations to keep the suspect isolated, and in South America, banks use the devices to prevent robbers from tipping off outside accomplices to departing customers leaving with large withdrawals.