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According to the FCC, jammers are illegal to sell and may not be operated, marketed or imported into the United States. In general, even local police aren’t legally allowed to use them.
Example of a mobile phone jammer, produced by Jammerspro. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting ...
Portable jammers are phone-sized and low-powered devices. They can block data delivery at a distance up to 15 meters without barriers. Stationary jammers are more expensive and powerful. They usually have a larger jamming radius and wider frequency band. Strong jammers can require additional cooling as they can overheat.
Consideration has been given to using cell phone jammers inside of prison walls to render them ineffective. The practice of jamming cell phone signals is illegal in the United States. Exceptions to this law have been considered for prisons, though there is concern that a cell phone could be a guard's lifeline in a crisis, and other rescuers may ...
Wi-Fi jammers, which could also block signals on police walkie talkies, are illegal under federal law. Assemblywoman Carol Murph, D-Mount Laurel, introduced legislation earlier this year that ...
"They are illegal devices, but these devices are getting in here regularly," he said. "I can get on the internet right now and buy one. They're not hard to get."
In 2014 the FCC issued an Enforcement Advisory warning the public that "it is illegal to use a cell phone jammer or any other type of device that blocks, jams or interferes with authorized communications" and that "this prohibition extends to every entity that does not hold a federal authorization, including state and local law enforcement ...
Each offense of selling or using an illegal radio jamming device carries a fine of over $100,000, the FCC said.