How does the police locate someone?

The mobile phone positioning of the police station is as follows:

Generally, this method should be used in major cases, or cases with great and bad influence, or gang cases, because the cost is very high. Those with great influence and serious circumstances such as catching spies. Public security organs will use technical investigation to locate mobile phones, but ordinary criminals will not use this method. When detecting specific cases (criminal cases that endanger national security, terrorist activities, major drug crimes and other serious social hazards), public security organs can take technical policy measures for relevant criminal suspects, including electronic monitoring, mobile phone monitoring, positioning and so on. It's just that it's relatively simple to get back the phone bill, SMS, or the location of the base station, but it's also decided by the Public Security Bureau. Mobile phone location refers to the technology or service that obtains the location information (latitude and longitude coordinates) of the mobile phone or the end user through a specific location technology, and marks the location of the located object on the electronic map.

Criminal Procedure Law of the People's Republic of China

Article 54 People's courts, people's procuratorates and public security organs have the right to collect and obtain evidence from relevant units and individuals. The relevant units and individuals shall truthfully provide evidence. Evidence materials such as physical evidence, documentary evidence, audio-visual materials and electronic data collected by administrative organs in the process of administrative law enforcement and case investigation can be used as evidence in criminal proceedings. Evidence involving state secrets, commercial secrets and personal privacy shall be kept confidential. Whoever forges, conceals or destroys evidence, and whoever the evidence belongs to, will be investigated by law.

Article 115 A public security organ shall investigate a criminal case that has been put on file, and collect and obtain evidence of the criminal suspect's guilt or innocence, whether the crime is minor or serious. An active criminal or a major suspect may be detained in advance according to law, and a criminal suspect who meets the conditions for arrest shall be arrested according to law.