Unicom card is a secondary card with yellow code.

It means that you have been to high-risk areas. If your Unicom mobile phone number is changed to a yellow code, you may have been to a high-risk area and stayed for more than 30 minutes, and he will choose the yellow code. In this case, you only need 14 days. After 14 days, it will automatically change to the blue code, so you don't have to worry about this, as long as you pay attention to personal protection at home 14 days.