Under normal circumstances, the train will not pass through the city for more than 4 hours and will not be judged as a resident. There is no record of aircraft crossing the middle and high risk area.
Communication Travel Card is a travel inquiry service jointly launched by Information Technology Research Institute of Ministry of Industry and Information Technology, China Telecom, China Mobile and China Unicom.
Travel itinerary results include the countries (regions) that you have visited in the previous 14 days and the domestic cities that have stayed for more than 4 hours. The color card only reminds the destination and has nothing to do with the health status.
Communication Big Data Travel Card can display all countries (regions) visited by users in the past 14 days and domestic cities with a stay of more than 4 hours. "Communication Big Data Travel Card" analyzes the mobile phone signaling data obtained through the base station where the user's mobile phone is located, and the collection, transmission and processing of signaling data are highly automated.