Do you need to open your eyes to see the health code? Upload materials.

Do you want to ask the health code? Do you need to open the traffic to upload data? Need.

It takes traffic to open the health code on the mobile phone to upload data, otherwise it cannot be uploaded. If there is no traffic on the mobile phone, you can see if there is a wireless WiFi network around. When the mobile phone is connected, you can open the health code and upload data.