It's true that knowing the cell phone number tells you where the person is

　　In order to track the location of a GPS device (such as a smart phone) through GPS, the GPS function of the device must first be turned on and able to receive the coordinate information sent back by the satellite, and then the device must send the coordinates to a specified network database (such as a website) through some software (such as an APP on the mobile phone). Then others can know the real-time location of the device through the website. Under normal circumstances, this process must be required to obtain the authorization of the user of the device, such as wechat public number through user authorization can obtain the real-time geographical location of the user. In other words, third party devices or institutions are not able to actively learn the location information of a GPS device! I've heard that China's Beidou system can do this, but I can't confirm it.

　　As for the location of the phone through the GSM cellular network (that is, base station positioning), this also requires the phone to be in the talking state (or network state), and the call time should be long enough, and then the coordinate position of the phone is obtained by calculating the signal strength of more than three base stations around the phone. In addition, this is something that only designated government agencies have the authority to do, not something that can be done casually on the Internet, let alone on a global scale! Otherwise, not only the criminals will have nothing to hide, but even we ordinary people will have no privacy at all!

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