Now the big data will automatically record the places you go, if you exceed four hours, then your trip card will be uploaded by the big data.
The communications big data itinerary card is a free query service provided by the China Academy of Information and Communications Technology (AICT) in conjunction with China Telecom, China Mobile and China Unicom, three basic telecom companies, using communications big data to provide Chinese cell phone users with information on all the places and cities they have visited in the previous 14 days. As of March 25, 2020, the cumulative query volume has exceeded 450 million times.