When you return to Hubei from high-risk areas in China and abroad, or when you cross the trip with infected people in COVID-19 in the same period of time, your health code will be automatically converted.
Depending on your exposure risk, the health code will be changed to "Yellow Code" or "red team". The "yellow code" indicates the need for home isolation, and the "red team" indicates the need for centralized isolation.
Because one of the transcoding rules of health code is to encode according to the roaming information of mobile phone signal, your health code will be automatically converted into "yellow code" or "red code" according to the different risks of the area where mobile phone signal roams.
If your mobile phone number is not handled with your ID card, you need to apply for transcoding to the residential area in time.