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The use of full-band signal jammers in school exams has become a trend, but there are many issues that need to be considered before use. For example, when the jammer is activated, the mobile phone will display a signal. Why is this? First of all, we need to understand how the full-band signal jammer works. It can emit radio signals that conflict with the signals between mobile communication devices, causing the devices to not work properly. When the jammer is activated, the mobile phone will display a signal, which may b... more