These are one of the most sophisticated spy products of the modern era. Though these are not normally used by any person in general, they are very important in many institutions like schools, colleges, hospitals, petrol pumps etc where the use of mobile phones are banned but still the people used them by disobeying the rules. So, these institutions have to use these jammers which block the mobile phones to receive service from its network provider and thus the cell phone becomes a useless object under the restricted areas of the jammer.
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