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 information of all the cities and municipalities that I have been to in the previous 14 days.

From 20:30 on January 8, 2021, the trip card will no longer mark the names of cities and towns containing medium- and high-risk areas in red, and will be changed to include medium- and high-risk areas in the bracketed remarks after the city name, with the remarks serving only as a travel reminder and not associated with health conditions.