CELLULAR DETETCION DEVICES provide another solution to the problem of CELL PHONE USE in QUIET or RESTRICTED AREAS. Cell Phone DETECTORS are often used by law enforcement and the military to home in and locate individual cell phone users.
In settings where the use of a JAMMER is illegal or restricted, the CELLULAR DETECTOR provides an alternative solution. Various types of DETECTORS exist; some which broadcast a voice warning when a cell phone user enters an area where the detector is located. Portable, hand-held detectors are often used in Prisons and by police and military personnel to home in and locate an active cell phone.  DETECTORS (sometimes called intelligent or passive detectors) are sometimes used in conjunction with a JAMMER. The detector activates the JAMMER only when an active cellular phone is in the restricted area which lessens the chance of RF pollution or signal spill-over.

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