Shandong health code itinerary card online time query on March 6, 2020 online. Communication big data itinerary card query service communication big data itinerary card, is the information China Institute of Information and Communication Research jointly with China Telecom, China Mobile, China Unicom three basic telecommunications enterprises using cell phone signaling data, through the user's cell phone is located in the location of the base station to obtain, for the country's 1.6 billion cell phone users free of charge to provide the query service in March 6, 2020 on-line. Cell phone users can use the service, query my first 14 days to all the cities and cities information. 2021 March 30, the national government service platform epidemic prevention health code has been integrated with the communications big data trip card related information, can be displayed in the health code users, whether they have been to the medium and high risk areas and other trip information, to help the health code a code pass.