What does the yellow code of the itinerary look like?

"red team banned, yellow code restricted, green code passed". If it is not a green code, find out the reason and issue relevant certificates before passing. According to local policies and regulations, colors may change.

If the person applying for health code changes according to the location and contact object, it may also become a yellow code or a red team, so users should leave as little as possible. If you want to go abroad, you need to open a unique local health code, because the policies in each place are different.

The "health code" can be used as a traffic checkpoint, public place, community, enterprise and important vehicle in the electronic certificate to show the health code to the inspectors to meet the local management requirements.

Principles of the Travel Code:

Using the "signaling data" of the mobile phone, the location information of the user is obtained through the location of the base station where the mobile phone is located.

Communication Big Data Travel Code is a free inquiry service provided by China Xintongyuan, China Telecom, China Mobile and China Unicom. By using the "signaling data" of mobile phones and the location of the base station where the users' mobile phones are located, mobile phone users can inquire all the city information they have visited in the previous 14 days through this service.