There is no way to keep the travel code unchanged when going abroad, because it will update the data in real time and cannot be stopped artificially, so it is impossible for people to keep the travel code unchanged when going abroad. Communication Big Data Travel Card is a free inquiry service provided by China ICT Institute, China Telecom, China Mobile and China Unicom for mobile phone users in China. Mobile phone users can query all the city information they have visited in the previous 14 days through this service.

"Communication Big Data Travel Card" is based on telecom big data, and the interface is provided by the three major operators. It only needs to fill in the mobile phone number and verification code and confirm my authorization. It doesn't need to fill in the ID number and home address, and it doesn't need to collect other personal information. The operation is simpler and safer, and the privacy of users is fully protected.

Travel codes marked with * (asterisk) indicate that there are medium or high-risk areas in the cities visited by users in the previous 14 days, but it does not mean that users have actually visited these medium or high-risk areas. Labels are only used as travel reminders and have nothing to do with health status. Generally speaking, after 14, it will be automatically updated on 15, and the asterisk on the travel card will automatically disappear.