How to Forbid Unauthorized Call ?

Posted on 13th Nov 2015 @ 9:32 AM

How to forbid unauthorized call in some special places ,such as gas stations,prisons and military bases?Well ,maybe we cannot adopt the general ways,you know that is useless.Especially in prisons,inmates are always to be educated and even ordered to give up mobile phones -- forbidden of course.So the officials have to take some direct and strong measures to forbid unauthorized call appearing.Mobile phone blockers are used for that as the devices is “the educated and strong” measure.

Mobile phones using is a big common problem to prisons :come through mails,trucked in babies’ diapers on family visits,sneaked in by prison guards...Inmates seems have many ways to get cellular phones and the state could not be changed.After getting cellular phones,inmates may plan gang attacks or coordinate hits on the outside.Mobile phone jammer help prison guards to keep safe on the inside environment.

The device sends out a low-power,encoded radio signal or modulated radio wave.Some signal jammers are designed to set signal to the same frequency as pagers and cell phones ,cut of current communication of base stations and mobile devices,and block new building communications.And others work as electronic filters that fool mobile phone into thinking there are no frequencies available to make or receive calls.Some jammers are designed to be adjustment to choose different working frequency ranges for jamming 2G 3G 4G. Like the mobile phone jammer is professional in jamming almost of signals,including 2g 3g 4g network.Inmates can not make and receive calls inside although they owned cell phones.So prison officials have no worries what inmates are planning to do ,connecting with outside via cell phones.

The mobile phone jammer is stationary ,covering range is about (20-100) meters@-75dBm still depends on the signal strength in given area,so please calculate the inside areas and how many units it should be,for the best jamming effect.