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24 Oct. 2022 Andrew

Why can cell phone blockers interfere with your cellualr signal?

cell phone blockers avoiding cheating

When it comes to shielding mobile phone signals, the first thing that comes to mind must be metal shielding, that is, placing the mobile phone in a closed metal box to block the propagation of electromagnetic waves through metal. However, it is obviously not practical to make all the classrooms in the examination room into metal-enclosed classrooms. then what should we do? It's very simple, only a small cell phone signal jammer is needed. For example, when the cell phone communicates with the base station, the signal jammer is like a troublemaker, deliberately making noise around you. The noise signal is so loud that the cell phone can't hear the base station at all. What is being said, and what the mobile phone is saying, the base station can't hear it. In fact, this is not to shield the mobile phone signal, but to bury the signal sent by the mobile phone in a large number of noise signals, so as to achieve the purpose of interference.

Now, cell phone blockers have almost become standard equipment in the examination room. Not only for middle and high school entrance examinations, but also for other types of qualification certificate exams, cell phone signal blockers are required to prevent candidates from cheating by contacting the outside world through wireless signals. Our mobile phones must emit qualified electromagnetic waves in order to connect to our telecommunications carrier base stations. Different communication systems use different frequencies, so that everyone is safe and does not interfere with each other.

The basic principle of cell phone jamming equipment is to emit the same radio frequency signal as the cell phone. Since the frequencies are the same, the cell phone cannot tell which signal is a regular base station signal, thus cell phone blocker just like the radio sometimes, it means that the signal is interfered, and the same is true for mobile phones, which can be interfered by natural electromagnetic waves and some signal-interfering devices. When the jammer is in working state, it can make the mobile phone within the specified range disorderly send and receive signals, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone appears to search the network, no signal, no service system, etc., so as to achieve the purpose of mandatory ban.

Similarly, the principle of Bluetooth and Wi-Fi signal interference is roughly the same. The difference between them is actually mainly in the different frequency bands. In mobile communication technology, 2G mainly works in the 900-1700MHz band, 3G works in the 1900-2100MHz band, 4G works in the 2300-2500MHz band, and 5G works in the 3400-3600MHz band. Bluetooth and WiFi work at 2.4GHz.

In order for some customers not to know the interference frequency used by their own equipment, we jammermfg have launched various common solutions, which can combine different signal frequencies, so as to avoid customers who buy the wrong product and cannot use it and increase the risk of return. Even some powerful full-band mobile phone signal jammers can interfere with all mobile phone signals on the market to achieve the purpose of completely shielding mobile phone wireless signals.