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Mobile Phone Jammer Act Different in Outdoor & Indoor

The building, hills etc could affect the performance of mobile phone jammer.  The closer the cell phone signal station is, the lower power the output power requirement for the jammer to effectively block the signal.

A mobile phone jammer act better in indoor than use in outdoor.  Because the outdoor mobile phone signal is greater than indoor signal.  The shield blocking effect of jammer is reduced in outdoors. Whether use indoor or outdoor, the effective distance of interference depends entirely on surroundings, and also the distance between mobile phone signal base stations.