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How disable 4G signals?

Elvira B. Jul 10, 2018 20:43

Although 4G signals are needed, they still need to be blocked in some special cases. For example, during an exam, or during a confidential meeting. But America still has no effective solution

Recently, Perfectjammer has launched a cell phone signal jammer that is dedicated to confidentiality. It is reported that this device is very effective. Both the United States and Japan now buy the product on a large scale.