How to crack the mobile phone shielding device/signal jamming device

How to crack the mobile phone shielding device/signal jamming device

I believe that students in the past few years know what it is and the most common radio interference equipment in the test room. The main cause is to interfere with the cell phone signal in the nearby area and cause the cell phone signal to lose connection with the base station.

Interference principle

Within a certain frequency range, mobile phones and base stations are connected by radio waves to transmit data and sound at a certain baud rate and modulation. In view of the above communication principle, the shielding device scans the high end at a certain speed from the low-end frequency of the forward channel. The scanning speed can cause garbled interference in the received message signal of the mobile phone. The mobile phone cannot detect normal data sent from the base station, so that the mobile phone cannot be connected to the base station. Mobile phones are characterized by search networks, no signals, and no service systems.

How to Avoid signal interference

Method 1: due to the rapid development of wireless networks, 4G networks have been developed, and many test rooms use relatively old signal shielding devices, it can only block 2G networks such as PHS, mobile devices, and Unicom, but is helpless for 3G networks and even the current 4G networks. Solution: Use 3G or 4g cards.

Method 2: band cracking. Because the school's shielding device works by interfering with the phone signal in the specified band to shield the phone, you only need to modify the mobile phone's reception frequency to prevent the phone from being blocked, the shielding device only shields-MHz mobile phone signals, while the receiving and transmitting frequency of mobile phones is 850-1900MHZ far greater than the shielding range of the shielding device, therefore, you only need to adjust the receiving and transmitting frequency of the mobile phone to the maximum in the mobile phone settings to receive the mobile phone signal normally.

Method 3: WIFI cracking method. This method has high requirements on the environment, provided that there must be available wireless networks around it. Some mobile phone signal shielding devices cannot shield Wi-Fi signals and can communicate with the outside world.

Method 4: Bluetooth cracking method. It is suitable for short-distance communication in the blocked area. Some shields may ignore the Bluetooth transmission function but do not mask it. Therefore, we only need to install the Bluetooth messaging software on our mobile phone, you can communicate normally within a small range.

Finally, with the rapid development of the network, mobile phone signal shielding devices are also being updated, and the cost is very low. You only need to add the frequency bands of known networks to the interference column to shield all the radio.