Why does the mobile phone show that there is still a signal after the mobile phone signal jammer is turned on?

Why does the mobile phone show that there is still a signal after the mobile phone signal jammer is turned on?

Why does the mobile phone show that there is still a signal after the mobile phone signal jammer is turned on?

Portable Mobile Phone Jammer Block GSM 3G 4G GPS WIFI Signal

When some customers use the mobile phone signal jammer, they often encounter such a situation. After the mobile phone wifi jammer is powered on and turned on, the mobile phone can no longer communicate, but the number of signal bars is displayed on the screen. This is because although the mobile phone can receive the signal from the base station, this signal is not enough to ensure that the mobile phone can communicate normally and access the Internet. The number of signal bars displayed on the mobile phone is false. The number of signal bars above will also disappear.

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