Just check the person's trip code and you can find out where he went.

Communication big data itinerary card is by the China Academy of Information and Communication Technology in conjunction with China Telecom, China Mobile, China Unicom three basic telecommunications enterprises using communication big data for China's cell phone users to provide free query service, cell phone users can use the service, query the person's first 14 days to the previous 14 days to the information of all the cities and municipalities. As of March 25, 2020, the cumulative query volume has exceeded 450 million times.