Call and tell me it's a yellow code, and it will turn into a green code later.

This is related to how the yellow code is displayed. In the current epidemic prevention environment, the color of health code has become the main electronic proof of citizens' health. If the user comes into contact with a patient or has been to a high-risk area, the color of the health code will turn yellow, but it will not turn yellow because of the space and physical obstacles during the call.