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Cell Phone Jammers is an instrument used to prevent cellular phones from receiving signals from or transmitting signals to base stations. When used, the jammer effectively disables cellular phones. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected.
Old mobile phone jammers sometimes were limited to working on phones using only analog digital cell phone standards. Newer models such as the double and triple band jammers like these model as example 3W Portable Mobile Phone Jammer , Cell Phone Jammer-101B , Cell-Phone-Jammer-JXB can jam all widely used systems CDMA, iDEN, GSM, et al. and are even very effective against newer mobile phones which hop to different frequencies and systems when interfered with. As the dominant network technology and frequencies used for mobile phones vary worldwide, some work only in specific regions such as Europe or North America.