Users are advised to check the network status of their mobile phones. You can disconnect the mobile phone network and then reconnect it. In other words, the problem can usually be solved by directly shutting down and restarting the mobile phone.
The health code is based on real data, which is declared by citizens on the Internet. After background review, the personal QR code can be generated. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.