Article by Jekky
History
br rapid proliferation of cell phones in the early 21th century to near ubiquitous status eventually caused problems examined in their potential use to invade the privacy of contributing to cheating school or industrial espionage, even using more public reaction against the increasingly intrusive phones disintegration of cells introduced into everyday life While older analog cell phones have often suffered from chronically poor reception and could not even be disconnected by the investigation of the interference that the simple high-frequency noise of increasingly sophisticated mobile digital devices have led to more sophisticated mobile phone counters are scrambling for alternatives to the more against costly mobile phones as Faraday cages looking mostly suitable as built in protection structures They were originally developed for law enforcement and the military to interrupt communications by criminals and Some terrorists have also been designed to thwart the use of certain remotely detonated explosives civilian applications were apparent if over time many companies originally contracted to design jammers for government use switched from selling these devices to private entities since then there has been a slow but steady increase their purchase and use especially in large metropolitan operation br br As other radio jamming cell phone jammers block cell phone use by sending radio waves on the same frequencies that cellular phones use This causes enough interference with communication between cell phones and towers to make phones unusable on most phones retail network would simply appear out of reach Most cell phones use different bands to send and receive communications from towers called full duplex Jammers can work by phone or disrupt the tower frequencies or tower to phone frequencies small portable models block all bands from 800MHz at 1900MHz in the range of 30 feet by 9 feet small appliances tend to use the old method while larger more expensive models may interfere directly with the tower, the radius of cell phone jammers can range from several tens of meters for pocket models to kilometers for more specialized units TRJ The jammer can block cellular communications for 89 a 5 mile radius 8160 km br In fact, it needs less energy to disrupt the signals of mobile phone tower the signal of mobile phone base station tower so called because the base station is located further away from the miserable and the mobile phone so the signal from the tower is not so strong br older jammers sometimes were limited to work on phones using only analog or older digital mobile phone standards as new models tested blockers double and triple-band can block all widely used system, CDMA iDEN and GSM colleagues are not even very effective against newer phones hop to different frequencies and which system when interfered with as the dominant network technology and frequencies used for mobile phones vary worldwide in specific regions that some survey work that Europe or the North America The jammer br s effect can vary greatly depending on factors considered that the proximity of the towers parameters inside and outside the presence of buildings and landscape, even temperature and humidity play a role br It is feared that rudimentary design jammers can disrupt the functioning of medical devices seeking as pacemakers, however, as the cell phones most commonly used devices operate at output power low enough to avoid causing problems 1W lt br br S ?Please help improve this article by adding Legal reliable references can be challenged and removed in March 2007 br Since these jammers actively broadcast radio signals they may or may not be legal to own or operate the basis of specific laws in the region is one of 160 citations necessary legal br br Armenia Australia illegally possess or supply to function br Belgium illegally possess and sell a portion of the spectrum operate licensed br Canada except by illegal federal agencies of law enforcement who have obtained approval PRC br Education Used by the Department as a method to thwart cheating in schools during the end of most examinations per year are used in mobile phone jammers surrounding areas to prevent high school students inside to receive calls or text messages can be used for illicit purposes, which in some municipalities, rather than the use of mobile signal jammers However towers near schools are closed temporarily for the duration of the week that the examinations are being illegally br br br Czech Republic Finland France illegally legalized cell phone jammers in movie theaters and other places with performances in 2004 abandoned due to complaints about calls for emergency still legally used inside prisons br Germany, but the illegal installation in prisons has been proposed br India puts religious government prisons and education institution jammers br Ireland illegally operate within Legally prisons used by the Prison Service of Ireland Italy br technically not illegal to possess, but not be operated because the Italian law expressly prohibits to disturb radio and telephone communications GSM jammers are however legal for use in places like churches, theaters movies hospitals and other places with performances and other buildings where and when the use of mobile phones may leak sensitive information retrieval repeatedly jammers are legal as long as their operational doesn t interfere with electronic medical equipment tested enables mobile phones and pacemakers to make emergency calls Tri-Band Jammers are reserved and in use with police forces and prisons are being tested Japan br llegal to use, but legal to buy own mobile short-range versions authorized the use of high output fixed long-term jammers is illegal with fines of up to max 250 000USD and or 5 years Prison br Mexico legally within prisons so often used in churches and hospitals br br New Zealand legal inside jails illegal to own and operate Norway, the police and the military can use jammers in situations in which it is legally within Pakistan br banks needed so often used in libraries br br illegally in Switzerland illegally in Turkey Only police and military use jammers legally br Ukraine planed to use in schools br UK illegally, but to use its own legal system in prisons has been proposed to exploit br U.S. illegally import or manufacture offer for sale including advertising Communications Act of 1934, with fines of up at 11 000 and imprisonment up to one year BR BR Notes and references HowStuffWorks How Mobile Phone Jammers jammers work how br br mobile work ComLaw Management Series notification that the Australian Communications and Media Authority prohibits the operation or the supply or possession for the purpose of the operation or provision of specified devices br Radio Communications Act of Canada br GSM jamming technology will be placed in all the New Zealand prisons NATIONAL PRESS TVNZ co nz BR BR BBC News blur the mobile phone signals in prisons inspector says br Communications Act of 1934, as amended by Telecom Act of 1996 br FCC wireless telephony services operations blocking jamming amp br br Apply Devices Cellular external links Silence Sweet but Illegal November 4, 2007 New York Times br Silent But Deadly Revenge on Mobile Jammer travelers Pratt November 18 2007 The Sunday Times, br Categories Categories Mobile Telecommunications items needing additional references from March 2007 All articles need references All articles with articles sourced statements with bound states from September 2008
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