Communication big data trip card, commonly known as "trip code". It is by the China Academy of Information and Communication Technology, China Telecom, China Mobile, China Unicom three basic telecommunications enterprises using cell phone "signaling data", through the user's cell phone is located in the base station location to obtain , for the country's 1.6 billion cell phone users to provide free query service, cell phone users can through the service, query the first 14 days of my visit to all the cities and towns of the information.

As of March 25, 2020, the cumulative query volume has exceeded 450 million times.

From 20:30 on January 8, 2021, the trip card will no longer mark the names of cities and municipalities containing medium- and high-risk areas in red, changing to a parenthetical remark after the city name containing medium- and high-risk areas, with the remark serving only 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 show the user in the health code, whether it has been to high-risk areas and other trip information, to help health code "a code pass". August 5, the State Council Joint Prevention and Control Mechanism held a press conference. Joint control mechanism 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.

Users in the Baidu App directly search "health code", the search results can be presented at the same time the user's local health code, the national government service platform "epidemic prevention and health information code". In the "epidemic prevention and health information code" page, "health code" has been integrated under the "communication big data itinerary card" information column, which can display whether the user has been to medium and high risk areas and other itinerary information.

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In September 2021, in order to help people travel safely, the national government service platform will integrate the health code and trip code "one page can check", open Alipay's health code at the same time can see the trip code. This means that the health code, trip code in the country to fully realize a page pass type "two code one".