TYPES OF CELL PHONE JAMMERS Pocket Cell phone Jammers – A 9 volt operated jammer which has a range of 30 feet. They block the signals coming from cell phone towers to individual cell phones. The frequency blocked is between 800MHz and 1900MHz. The TRJ-89 jammer - can block cellular communications for a 5-mile radius. Interrupts the signal directly with the tower instead of disrupting the radio waves.

APPLICATIONS law enforcement facilities, government offices, rehabilitation centers, military areas, embassies, etc. military to interrupt communications by criminals and terrorists In executive offices, board meetings, conferences, seminars, libraries, cinemas, religious places, public transport, concert halls, restaurants and educational institutions etc areas where radio transmissions are dangerous, such as chemical storage facilities or grain elevators.

Corporations use jammers to stop corporate espionage by blocking voice transmissions and photo transmissions from camera phones. To maintain the complete silence in library and lecture hall. To avoid fraud in examination hall. To avoid disturbance in class room.

LEGAL ISSUES COUNTRYLEGALITY AustraliaIllegal BelgiumIllegal to sell, possess and operate CanadaIllegal IndiaLegal: Government and schools use jammers. MexicoLegal inside jails, often used also in churches and hospitals. New ZealandLegal inside jails NorwayIllegal to own and operate. The police and the military can use jammers in situations in which it is necessary. UKIllegal USAIllegal to operate, manufacture, import, or offer for sale, including advertising

Some of the radio communication services that are affected by cell phone jammers are: Multichannel voice communication that use point-to-point data transmission Broadcasting links Studio-to-transmitter links Cordless telephones Wireless LANs Low-power devices The main reasons why many governments are banning cell phone jammers are: 1. Property theft - Radio Spectrum allotted by the government for radiocommunication, should not be stolen. 2. Safety hazards - All calls will be blocked if cell phone jammers are employed, including emergency calls.

ALTERNATIVE Passive cell phone blocking Companies are working on devices that control a cell phone but do not "jam the signal." Cell-phone alerters Other alternatives are micro-cells, handset disablers etc. Through SIM-blocking or IMEI blocking, cell phone communication can be blocked.

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