A few days before the visit in November 2003 of the United States President, George Bush, to the United Kingdom, the British press speculated to no end about the extraordinary security measures that would be taken to protect the visiting president against possible terrorist attacks. In addition to fretting about such routine measures as street [...]

Jammers can be used to address safety issues. In many jurisdictions, fire code regulations require that mobile phones must be switched “off” in any area that has a potentially explosive atmosphere.  This includes gas stations, where sparks could cause an explosion or fire. These preventable accidents occur more frequently than most people are aware. Areas [...]

Jammers can protects against breaches of security policy. Cell phones are innocent looking communication devices, but they enable continuous transmission of audio and data.  In secured places, where policy does not warrant the use of mobile phones, it is almost impossible to detect a person conducting cell phone conversations or other misuse. Examples of places [...]

A cell-phone jammer transmits radio signals to cut off communications between cell-phones and their networks.  If you activate a phone jammer, all idle phones nearby will indicate “NO NETWORK.” Incoming calls are blocked, as if the cellular phone were off. When the phone jammer is turned off, all cell-phones will automatically re-establish communications and provide [...]