Can cell phone jammers block all communications?

In school exams, in order to prevent students from using mobile phones to transmit information, leak test papers, and cheat in exams, some also prevent teachers from leaking test paper information on the way to escort the test papers, which will have a bad impact on the later exams.

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Can the test cell phone signal jammer block all communication signals? Speaking of which, many people are unfamiliar with the test signal jammer. In fact, it has been widely used in the examination rooms for the college entrance examination. The response has been very good, and it has been proven that it has a good effect on eliminating electronic signal cheating methods. Since this year, it has been vigorously promoted, so that more test rooms can also install mobile phone signal jammers.