Why does the cell phone still have a signal after turning on the cell phone jammer from dojammer's blog

In recent years, in various national examinations, cases of cheating with mobile phones have occurred from time to time, seriously affecting the fairness and justice of the examinations. For this reason, the state stipulates that cell phone jammers must be equipped during important examinations to create a fair examination atmosphere for candidates. So, after turning on the cell phone jammer, why do some mobile phones still show signals?

1. The cell phone shows that there is a signal, and when the mobile phone makes a call, if the mobile phone can connect the call normally, and the call quality is relatively high and not affected, this situation indicates that the cell phone jammer area has not achieved effective shielding. If the mobile phone is close to the cell phone jammer, there is no signal, which means that there is a base station or signal amplification at your location, and then it means that the cell phone jammer you are currently using cannot meet your on-site shielding requirements. You can install more high-power cell phone jammers.

2. The mobile phone shows that there is a signal, but the call quality of the mobile phone is relatively poor. If this is the case, it means that the shielding effect of the cell phone jammer on the mobile phone is in a critical state, with a shielding effect, but the shielding range is unstable. This situation may be that the signal strength from the base station to the site of use fluctuates, and this situation may also occur with some mobile phones with strong anti-interference.

3. The mobile phone shows that there is a signal, but in fact the signal is false. The mobile phone cannot make calls normally, nor can it access the Internet. When making a call, the mobile phone will suddenly show no signal or limit the service. At this time, it can be determined that the signal displayed on the mobile phone is a false signal, but in fact the mobile phone is blocked.

The size of the shielding range of the cell phone jammer depends on the strength of the cell phone signal at the location of the user unit. Where the mobile phone signal is strong, the shielding distance of the cell phone jammer will be shortened. Where the mobile phone signal is weak, the shielding distance of the cell phone jammer will be far.