Data not recorded.

Because the trip card service uses base station data, in order to ensure continuous communication and achieve blind coverage, the signals of two base stations located at the intersection of administrative divisions may be cross-covered, resulting in biased results. In addition, stays in the city of less than 4 hours will not be recorded. If the test result has a large deviation, please contact customer service for prompt action.

The iterative card is based on telecom big data, and the interface is provided by three operators. You only need to fill in the cell phone number, verification code, and confirm the authorization. There is no need to fill in the ID number and home address, and no other personal information is collected.

Development history:

From February 13, 2020, the service provided by the three major carriers to check itineraries by SMS has covered more than 200 million users.

February 29, 2020, the SMS query was upgraded to a code scanning query, and a unified web query portal was provided.

Beginning on March 6, 2020, the function of inquiring about overseas places of visit was launched on the "Communications Big Data Itinerary Card", which can check information about overseas countries or regions visited by cell phone users in the previous 14 days, and can promptly detect problems of concealment, omission and inaccurate declaration of itinerary information.

As of March 25, 2020, the cumulative number of inquiries has exceeded 450 million.

Reference for the above: Baidu Encyclopedia - Communication Big Data Trip Card