Cracking method 1: Enter the cell phone settings, click "Network Settings", change the network mode to "Manual Model" and then enter "Online Search".

Principle: The work of the cell phone starts within a certain frequency range. The cell phone signal blocker can only block the phone signal without affecting other nearby electronic devices; save power, the power is 12W-480W.

It is also called cell phone signal blocker, cell phone signal blocker, phone jammer, signal jammer, cell phone blocker, signal obstruction device, cell phone signal isolator, signal isolator, cell phone signal interceptor, radio signal blocker, etc. according to its function.

In order to solve the information security problem during the examination process, many examination halls usually use cell phone signal blockers and conduct external signal interference within a certain range in some ordinary high schools.

How does the blocker interfere with mobile phone signals?

Simply put, the cell phone signal blocker is to block the phone and base station through radio waves within a certain frequency range, and complete the data and sound transmission with a certain baud rate and modulation method to interfere. In fact, during the work process, the mobile phone contacts the base station through the uplink frequency, and then transfers the signal to the MSC mobile service switching center to realize the call.

Cracking method 2

1. Use Bluetooth: upload the answer to the file with the mobile phone.

The cell phone signal jammer uses microwave radiation interference technology to emit tangible electromagnetic signals within a certain distance range.

2. Method of cell phone signal jammer.

It uses frequency multiplication, frequency division, frequency hopping filtering and other technologies for the uplink and downlink channels of the mobile system to analyze the required screen magnetic field; customize the spherical shielding space according to the power size of the jammer, and automatically form a shielding magnetic field within the specified range, so that the phone in the space loses the mobile phone.

The cell phone signal jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during operation. The scanning speed can form a chaotic code interference in the phone in the received message signal. The mobile phone cannot detect the normal data sent by the base station, so that the cell phone cannot establish a connection with the base station. In order to cope with the continuous development of the communication system, the third-generation cell phone signal jammer has been carefully developed according to the actual situation of foreign mobile communications.

The examination room must strengthen discipline and specialize in the main examination and monitoring of the test process, prohibiting any cheating. In addition, the cell phone signal jammer is also suitable for all prohibited places such as military, government agencies, prisons and gas stations.

When the cell phone signal jammer is in working state, it can make the mobile sending and receiving signal function in the specified range invalid and unable to dial out and dial in, thus achieving the purpose of mandatory disabling.