Why is it that the itinerary code is recorded if it is less than 4 hours old?

If the itinerary is less than 4 hours, it may be due to discrepancies in the service data of the itinerary card. If you pass through a certain city for less than 4 hours, it will generally not be recorded. If you find that the itinerary card turns yellow, you should call the operator of your mobile phone number to lodge a complaint and ask them to correct the itinerary information.

What is the itinerary card? The full name of the itinerary card is "Communications Big Data Itinerary Card". It is a query service provided free of charge by China Academy of Information and Communications Technology for mobile phone users across the country. It can query the information of prefectures and cities visited in the previous 14 days. The itinerary card is obtained by three basic telecommunications companies, China Telecom, China Mobile and China Unicom, through the base station where the user's mobile phone is located. In September 2021, the national government service platform integrated the health code and itinerary code into a "one-page search". You can see the itinerary code when you open the health code in Alipay.