1. You can find the health code. Most health codes are located according to cell phone signals, and the operator will display each base station you are connected to.
2. The health code is based on real data, which is declared by citizens on the Internet, and the QR code belongs to individuals after background review. The public can apply on WeChat or Alipay.
3. There are three kinds of health codes: the green code means that it can pass normally without abnormality, the red code is isolated for 14 days, and the yellow code is isolated for less than 7 days.