Communication big data itinerary card, by the China Institute of Information and Communication Technology, China Telecom, China Mobile, China Unicom three basic telecommunications enterprises use cell phone "signaling data", through the user's cell phone is located in the location of the base station to obtain, for the country's 1.6 billion cell phone users free of charge to provide query services, mobile phone users can through the service to check my previous 14 days to all the places and cities. Cell phone users can use the service to inquire about all the cities and towns that they have visited 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 parentheses after the name of the city, with the note only serving as a travel reminder and not associated with health status. On March 30, the national government service platform "anti-epidemic health code" has integrated "communication big data trip card" related information, can be displayed in the health code users, whether they have been to medium and high-risk areas and other trip information, to help the health code "a code pass". August 5, the State Council joint prevention and control mechanism held a press conference, which was held in the city. Joint control mechanism of the State Council held a press conference, "communication itinerary card" cumulative query service of more than 12 billion times, become an important means of prevention and control of epidemics around the world.