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Hidden signals from library phones?

Bert December 2019

Recently, when I went to the school library, a very strange thing happened. My mobile phone had almost no signal, and I missed a few calls from friends. When I walked out of the library, the mobile phone signal recovered. Normal, what is the reason for this?

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Jammer-Mart December 2019
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According to my analysis, your school library is likely to have a wifi jammer. As far as I know, many school libraries are equipped with this mobile phone signal jammer device to prevent the quietness of the library from being disturbed, such as sudden ringtones and mobile phone calls.