The trip code can be detected when you go out of town.

Introduction of the trip code ：

Communication big data trip card is by the China Academy of Information and Communication Technology in conjunction with China Telecom, China Mobile, China Unicom, three basic telecom companies using communication big data for China's cell phone users to provide free query service, cell phone users can use the service, query my previous 14 days to the All the information of cities and towns.

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

Starting at 20:30 on January 8, 2021, the trip card will no longer mark the names of cities and towns that contain medium- and high-risk areas in red, and will change to include a parenthetical note containing medium- and high-risk areas after the name of the city, which will serve as a travel reminder only and will not be related to health status.

March 30, 2021, the national government service platform "epidemic prevention 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, help! The health code is a "one-code pass".

Introduction of Trip Code Service:

The "Communication Big Data Trip Card" is a query service provided free of charge by the China Academy of Information and Communications Technology (AICT) in conjunction with three basic telecommunication enterprises, China Telecom, China Mobile and China Unicom, for 1.6 billion cell phone users across the country, utilizing communication big data.

"Communication big data itinerary card" based on telecommunications big data, by the three operators to provide a unified interface, only need to fill in the cell phone number, verification code and confirm my authorization, no need to fill in the ID card number, home address, do not collect other personal information, the operation of the simpler and safer, to fully protect the user's privacy.

References to the above? Baidu Encyclopedia - Trip Codes