How does the trip code record the trip?

Travel code refers to the communication big data travel card, which uses the "signaling data" of the mobile phone to obtain the travel record through the location of the base station where the user's mobile phone is located. The communication itinerary card records your itinerary by using China Mobile's mobile phone operator to inquire about my visit information during the epidemic period 14 days. The inquiry service is mainly aimed at domestic mobile phone users, accurate to domestic provinces and cities (staying for more than 4 hours) and accurate to foreign countries.

The service was launched by China Information and Communication Research Institute of the Ministry of Industry and Information Technology in conjunction with three major telecom operators. Using the communication big data of China Telecom, China Mobile and China Unicom, it provides travel inquiry service for 654.38+06 billion mobile phone users nationwide.

In order to facilitate users to inquire and prove their epidemic prevention health status, the national comprehensive government service platform has now incorporated the information of "communication big data travel card" into the "epidemic prevention health code" service. In the process of domestic and overseas trip declaration and inquiry, after users declare the domestic cities and overseas countries (regions) that they have visited in the past 14 days, the system will check the declaration information with the data of "Traffic Big Data Travel Card" to avoid false reporting.

If the itinerary declaration is verified to be correct, the system will synchronize the declaration information in the "Epidemic Prevention Health Information Code", and comprehensively inquire about personal epidemic prevention health risks in combination with information such as whether the patient is diagnosed or suspected, whether the person is in close contact, and whether the person has recently entered the country.