How to prevent network police from monitoring their phone calls and text messages?

You can check the communication record (communication list) of your number after sending a message or making a phone call to see if there are any other suspicious communication records.

The main job of network police is to search, monitor and manage all kinds of Internet cafes online, retrieve harmful information such as obscenity, reaction and spreading rumors online, track down criminal suspects according to online reporting clues, and investigate and deal with other cyber crimes.

Network police will generally investigate and deal with illegal and criminal activities carried out by borrowing network platforms through monitoring, including online fraud such as publishing obscene information and pictures. Once there are violations of law and discipline on the network, the network police monitoring system will prompt and issue an early warning, directly record the violations and reserve evidence for investigating and handling criminal acts.

As long as your behavior does not involve illegal crimes, the network police will not interfere with you, let alone monitor you. Network police can't just monitor anyone and pry into personal privacy.

Only individuals who violate the law and discipline will be monitored by the network police. These acts include inciting secession, promoting terrorism, promoting ethnic hatred and discrimination, spreading violent, obscene and pornographic videos, fabricating false information and undermining public safety. Once you trigger the law online, the network police can directly lock your mobile phone number and location information and collect criminal evidence.