How long have you stayed in Xi'an? Big data shows that you have been to Xi'an

Generally, when the mobile phone passes through a place and stays there for about an hour, the track will be displayed.

You can use the user's number to evaluate close contact groups and whether they have appeared in high-risk areas. You can also evaluate the user's location and how far away it is from the nearest community where the epidemic has occurred. In addition to telecom mobile phone users, mobile phone users of China Mobile and China Unicom can also query personal activity tracks. Of course, the three major telecom operators all stated that roaming information only provides information about the cities they pass through, but does not provide accurate location, length of stay, etc. This business is a public welfare service, and the query results are for reference only and shall not be used as the basis for final judgment. The communication big data itinerary card analyzes mobile phone signaling data, which is obtained through the base station location of the user's mobile phone. The collection, transmission and processing of signaling data are automated, and there is a strict security and privacy guarantee mechanism. The query results are available in real time and conveniently Fast.