The cell phone jammer system is a relatively professional modern communication signal shielding technology, especially in the special environment of prisons, which puts forward higher requirements on the mobile phone signal shielding technology. For example, in the application environment of the communication signal shielding system of a general meeting, the participants come and walk in a hurry, and there is almost no time to “search” for the blind area of the communication signal shielding. In the special environment of the prison, the number of people is dense and the activities are more concentrated. As long as criminals have a mobile phone, it is easy to “search for a long time” to find blind spots for blocking. Even if the criminal does not deliberately search for blocking blind spots, all pervasive text messages will expose the missing blind spots. 1. How to evaluate the effect of the cell phone signal shielding system in the prison? If there is no blind spot in the prison, it should be tested repeatedly. In places with relatively strong signals, such as “windows” or “every corners”, professional equipment detectors should be used. The construction party can also entrust the local relevant departments to conduct professional inspections for equipment. , Radiation, and interference to other systems; no blind spots; compliance with the inspection regulations of relevant departments. 2. What is the problem of shielding effect and external interference? The high-quality mobile phone signal shielding system project must be completely shielded without affecting the communication of residents, not letting people complain, not allowing mobile and China Unicom to cause trouble, and the shielding area is more accurate, and there is no interference outside the shielding area, and it can be regarded as a complete acceptance project. 3. The problem of upgrading and expansion? The wireless communication technology is developing rapidly. 3G is currently in the trial operation stage. Yesterday, the system could be completely shielded, and there may be problems today. Therefore, the construction of the shielding system should be modularized and can be easily upgraded according to the changes of the surrounding communication facilities, so as to substantially save the project investment and achieve permanent shielding. 4. System after-sales service and engineering case The mobile phone signal shielding system project is a highly professional project, and an imperfect after-sales service system will inevitably bring obstacles to the healthy and long-lasting operation of the system. Excellent mobile phone signal shielding system suppliers and manufacturers have the awareness and team to provide high-quality after-sales service, and will do a series of after-sales services such as regular return visits and system upgrades to effectively solve customer problems. For professional projects like “prisons and detention centers”, engineering cases represent the technical strength of suppliers and manufacturers. Whether the project is well done or not, the past cases are the most convincing.