1. The calculation of a user's trips within the first 14 days is done in the operator's back office and results in a one-day delay. For example, on March 5, data is calculated for trips made in the 14 days prior to March 4 (between February 20th and March 4th).

2. As the service uses base station data, in order to ensure continuous communication and achieve coverage without blind spots, the signals of the two base stations at the junction of the administrative divisions may be cross-covered, resulting in a deviation of the results, which can be adjusted accordingly when using the service in conjunction with other proofs.

3. In addition, a stay in one city for less than 4 hours will not be recorded. Overseas travel records require that you have enabled the use of international roaming services during your time abroad. Please contact customer service if there is any serious deviation from the results.

Communication big data itinerary card

Communication big data itinerary card, by the China Academy of Information and Communication Technology in conjunction with China Telecom, China Mobile, China Unicom and the three basic telecommunication enterprises to use cell phone signaling data. 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, cell phone users can use the service, query my first 14 days to all the cities and municipalities information.

As of March 25, 2020, the cumulative query volume has exceeded 450 million times. starting 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, and will be changed to include medium and high-risk areas in the bracketed remarks after the city name, with the remarks serving as a travel reminder only, and not associated with health conditions.

On March 30, 2021, the national government service platform "epidemic prevention health code" has been integrated with the "communication big data itinerary card" related information, the health code can be displayed in the user, whether they have been to medium and high risk areas and other trip information. On August 5, 2021, the State Council Joint Prevention and Control Mechanism held a press conference, "communication itinerary card" cumulative query service of more than 12 billion times, to become an important means of prevention and control of epidemics around the world.