Itinerary code is a function of the State Council client applet, which can query the domestic and international itineraries of individuals in the past 14 days, and accurately determine the provinces and cities that have stayed in China for more than 4 hours. Foreign countries are accurate to the country. Once the user is found to have stayed in the risk area, the travel itinerary code will change color.

Introduction: Communication Big Data Travel Card is a free inquiry service provided by China ICT Institute in cooperation with three basic telecom enterprises, namely China Telecom, China Mobile and China Unicom, through the location of the base station where the user's mobile phone is located. Mobile phone users can query all the city information they have visited in the previous 14 days through this service.

Users can directly search for the health code in Baidu App, and the search results can simultaneously present the health code of the user's location and the epidemic prevention health information code of the national government service platform. The information column of the communication big data travel card has been integrated under the health code of the epidemic prevention health information code page, which can show whether the user has been to high-risk areas and other travel information.