cell phone jammer are common
There are many reasons why a cell phone signal jammer can be used. Some of them can be used legally, thanks to permission from local authorities. Cell phone jammers are typically used in places where either for security reasons or due to forced mobile silence – mobile signals are blocked and they cannot ring.
Cell phone jammer is an instrument that prevents cell phones from receiving signals from base stations. When used, the jammer effectively disables cell phones. These devices can be used in virtually any location, but are mainly located in locations where a phone call would be particularly disruptive because silence is expected.
When a cell phone jammer is active, most cell phones do not display a network signal, and when the GSM jammer is turned off, the cell phone becomes active. Mobile phones use unique frequencies for speaking and listening. Most cell phone jammers block one of the two frequencies, indirectly creating the effect of preventing both. Cell phone jammers work on the same principles as jammers that prevent radio communication. They work either by interrupting the frequencies from mobile phone to base station or from base station to mobile phone.
Cell phone jammers are used by law enforcement agencies and the military to limit and disrupt communication during various situations. Certain companies use cellphone jammers to prevent corporate espionage by blocking communication in sensitive areas. Some people also use portable cell phone jammers to prevent others from using cell phones in their immediate area.
Can something keep drivers from speaking on their phones? A new jammer made by Indian engineers could make the decision out of the hands of the drivers by disabling their phones while passengers can continue talking or texting.
The system uses RFID (Radio Frequency Identification) technology to track whether a driver is trying to use his phone with the car in motion, according to Smithsonian Magazine. This triggers the jammer to stop the driver’s phone – a more effective measure than smartphone apps that need to be installed on the culprits’ phones.