Cannot be found. As of December 26, 2022, the national epidemic situation has been fully relaxed, the itinerary code applet has been offline, and the itinerary code cannot find records from three years ago. The itinerary code is the communication big data itinerary card. It is a free query service provided by the Academy of Information and Communications Technology in conjunction with China Telecom, China Mobile and China Unicom to use communication big data to provide mobile phone users.