The trip code looks like the picture:

Communication Big Data trip card query results show the provinces and cities visited (domestic), countries and regions (international), a **** is divided into three kinds of cards: green, yellow and red, the rules will be adjusted in real time according to the actual situation. The calculation of the user's trips within the first 14 days is done in the operator's back office, with a one-day delay in the results.

In addition, 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 administrative divisions may be cross-covered, resulting in deviations in the results, which can be used in conjunction with other proofs to make corresponding adjustments.

Extended Information

The trip card uses Bluetooth signal strength to determine the distance between the user and others, and contact records will be encrypted and stored in the user's respective cell phone, so that if no one is infected with C.N.C.P.D. during the period of use, the data will be automatically cleared after 21 days (the time will be adjusted according to the needs of prevention and control in real time).

Once a user is diagnosed as a confirmed/probable C.N.C.P. patient, the epidemic prevention and control department will require them to upload the contact record information in their cell phone, which will help epidemic prevention and control personnel to locate close contacts more quickly and remind them to observe and isolate them in a timely manner.

Baidu Encyclopedia - communication big data itinerary card

People's Daily Online - itinerary card 2.0 online? Bluetooth "black science and technology" to help normalize epidemic prevention and control