In recent years, with increasing awareness of confidentiality, many places have installed mobile phone signal jammers. But sometimes people encounter the problem of the mobile phone signal jammer being turned on, but the phone still shows a signal. Why is this?

There are several situations where mobile phones have signals.
1. The phone displays a mobile signal and is not affected at all when making calls or accessing the internet. This indicates that the mobile signal jammer has not achieved effective interference. If the phone is close to the mobile signal jammer and there is no signal, it indicates that there is a base station or signal amplification in your location. This further indicates that the mobile signal jammer you are currently using cannot meet your on-site signal interference requirements, You can install more high-power mobile phone signal jammers.
2. The phone displays a signal, but the quality of the phone call is relatively poor. If this situation occurs, it indicates that the interference effect of the phone signal jammer on the phone signal is in a critical state, with interference effect, but the interference range is unstable. This situation may be due to changes in the signal strength from the base station to the site of use, as well as the use of some highly anti-interference mobile phones.
3. The phone displays a signal, but in reality, the signal is false. The phone is unable to make normal calls or access data online, and when making a call, the phone will suddenly display no signal or restrict service. At this point, it can be determined that the signal displayed on the phone is a false signal, but in reality, the phone signal has been interfered with.
The interference range of a mobile phone signal jammer depends on the strength of the mobile phone signal at the location of the user. In places with strong mobile phone signals, the interference distance of the mobile phone jammer will be reduced, while in places with weak mobile phone signals, the interference distance of the mobile phone signal jammer will be far.