How do signal jammers work and how to crack them?

There are generally two ways to shield mobile phone signals:

1. Use a metal mesh bag: This method is similar to the principle of closed-circuit television. Putting the mobile phone in a metal mesh bag can basically shield all electromagnetic waves.
2. Signal interference: In some areas, mobile phones may lose signals due to the presence of electromagnetic wave transmitters. This transmitter works on the same frequency as the mobile phone, interfering with the signal transmission of the mobile phone.

At present, the mobile phone signal blocker on the market uses the method of signal interference. Although the principle is simple, it is illegal to use this frequency band privately and cannot generate commercial value. However, schools have begun to use signal blockers to prevent cheating. Let’s learn how it works.

1.Working principle of mobile phone signal blocker: interference with downlink signals

Here is a specific schematic diagram to illustrate this process:

When a mobile phone is in use, it will work within a specific frequency range. The mobile phone and the base station use radio waves to transmit data and sound at a certain baud rate and modulation method. Based on this communication principle, the mobile phone signal blocker will scan the frequency range of the forward channel from low end to high end at a certain speed during operation. This scanning speed will cause garbled interference in the message signal received by the mobile phone, and the mobile phone will not be able to detect the normal data sent by the base station, which will cause the mobile phone to be unable to establish a connection with the base station, resulting in no network search, no signal, no service, etc.

Simply put, the mobile phone signal blocker blocks the downlink frequency of the base station signal.

2.Specific implementation of the function of the mobile phone signal blocker:

Common specifications include a shielding range of 10 meters, a DC power supply of 5V, etc.

3.Basic performance:

The performance parameters of most cell phone signal jammers on the market are as follows:

• Transmitting frequency range: 860-960MHz, 1.800-1.990GHz
• Transmitting power: 1W±200mA
• Ambient temperature: -20 to 55℃
• Relative humidity: 30% to 95%
• Functional frequency band: CDMA800, GSM900, DCS1800, PCS1900, PHS
• Control range: about 40 meters

4.Cracking mobile phone signal jammer:

There are several ways to crack mobile phone signal jammers:

• Number segment cracking method: Some schools use older signal jammers that can only block specific number segments, such as Xiaolingtong, China Mobile, and China Unicom. Newer segments such as China Telecom Tianyi 186, China Unicom Wo number segment, China Mobile TD-SCDMA and other number segments cannot be blocked.
• Frequency band cracking method: By modifying the receiving and transmitting frequencies of the mobile phone, you can avoid being blocked. Cell phone signal jammers generally block signals in the 900-1800MHz range, while cell phones receive and transmit in a wider range of 850-1900MHz. Adjust the cell phone frequency setting to the maximum and the cell phone will be able to receive the signal normally.
• Wi-Fi cracking method: This method requires specific conditions and a compatible cell phone. By connecting to an available Wi-Fi network, the internet can be accessed even if the cell phone has no cellular signal or data. This allows the use of search engines such as Baidu or messaging platforms such as QQ to discreetly find and send information.

Please note that while these methods may be mentioned, it is important to comply with laws and regulations regarding the use of cell phone signal jammers.

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