The signal blockers were originally made by law enforcement officers to intercept terrorists and criminals messages. Today, the cell phone jammers are largely being used for official purposes to fight against terrorism. Right from suppression of communication as a preventive measure for organized crimes, to neutralizing remote controlled bomb explosions. It is even believed that the effort to assassinate influential leaders was nullified with the use of jammers.
It is the development of technology that makes the jamming units performs in the way they are. A particular signal is radiated by the cell phone jammer unit which in turn jams the remotely controlled receivers. Thus, it prevents the execution of any coded command parties. At the same time, the devices that are outside the protected area continue to remain unaffected.
The cell phone jammer units make use of specially coded transmissions so that the receivers of GSM devices can be deceived. Thus, the cell phone’s connection to the base stations is prevented.