The number is connected with the Guangdong number. When I come to Yunnan and receive Vietnam information, can the itinerary card change the yellow code and go to Changdong?

It should be based on the actual situation.

If there is an asterisk on the itinerary card, it means that you have only visited areas with medium and high risk areas, but have not been to medium and high risk areas. This type of travel card usually does not change color or turn yellow. If there is an asterisk on the itinerary card and you have traveled to a medium-risk area, it is likely to change color and become a yellow or red code. This is a kind of isolation test.

The color of the itinerary card is yellow, which means you have entered a medium risk area. After 14 days of self-isolation, the yellow color turns to green, which is normal.

The itinerary card is the code of the big data itinerary card, which is also equivalent to the health code. This product is data received by the mobile phones of three major telecommunications companies, China Academy of Information and Communications Technology, China Telecom, China Mobile and China Unicom. The data is obtained through mobile phone positioning points and provides free query services to 1.6 billion mobile phone users across the country. Mobile phone users can query data on all regions I visited in the past 14 days.