Travel codes will no longer be marked with red names of cities containing medium and high-risk areas, but will contain medium and high-risk areas in brackets after the city names. The above remarks are only used as travel tips and have nothing to do with health status.
The travel code is located by mobile phone GPS to generate whether you have been to medium and high risk areas.
Travel code is the code of communication big data travel card, which is also equivalent to health code. China Institute of Information and Communication, together with China Telecom, China Mobile and China Unicom, used mobile phones to receive data, which was obtained through the location of the base station where the users' mobile phones were located, providing free inquiry service for the 654.38+06 billion mobile phone users nationwide. Mobile phone users can query all the city information they have been to before 654.38+04 days through this service.