Traditional illegal communication control methods mostly use signal shielding and communication control solutions, which essentially use high-power signals to suppress the existing network. Its disadvantage is a pain point. The transmission power is high, which is easy to generate electromagnetic radiation and consume too much power, which interferes with the use of nearby residents and police communication. It is also impossible to track. For illegal communication, it is impossible to sense, locate its location, and track the person using it.

The smart phone control system abandons the traditional "high-voltage" high-power signal suppression method and adopts the "early warning" mode of active detection: using a low-power signal transmitter to collect illegal mobile phone terminals, actively reporting the early warning to the background, and then using portable devices to locate and capture illegal mobile phones.

Mobile phone detection: can detect mobile phones within the coverage area, collect information for reporting, and alarm.

Black and white list deployment: control the black and white lists of the coverage area, the white list (police communication) releases normal communication, and the black list (unreported, illegal use) senses and alarms its approximate range.

Positioning search: After the detection device alarms and reports the approximate location, the target mobile phone is searched through the precise positioning device and finally found (the mobile phone must be turned on)

Tracking and tracing: For the detected blacklisted IMSI, the mobile phone number of the blacklisted user is associated through the operator and other channels, so as to trace the illegal communication.