If both cell phone numbers are turned on and in use, then both will display the corresponding travel card.

Communication big data trip card, by the China Institute of Information and Communications Technology in conjunction with 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 free of charge to provide query services, the cell phone users can use the service to check their own personal information, the number of cell phone users. 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 relating to health status.

The health code can be displayed in the user, whether they have been to 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, the "communication trip card" cumulative total to provide query services more than 12 billion times, and become a local government service platform. The service exceeded 12 billion times, become an important means of prevention and control of the epidemic around the world.

Related Information

"Communication big data itinerary card" analyzes the "cell phone signaling data The data from the "Communication Big Data Travel Card" can be used nationwide to provide comprehensive coverage of the country's one network, and it can also be used to query the international travel of my domestic cell phone number.

These will provide scientific and accurate technical support for epidemic prevention and control, resumption of work and production, road access, and entry and exit under the premise of ensuring user information security. In order to ensure continuous communication, realize the coverage of no blind area, to provide better quality of communication services, the administrative division of the junction of the two places of the base station signal may be cross-coverage, resulting in the deviation of the results.