I just called when I entered Wenzhou epidemic prevention and control. How did he know that I had arrived?

The epidemic prevention and control center checks the personal travel trajectory through big data (mobile phone number, etc.). ).

By using big data analysis to check whether citizens come back from key epidemic areas, and send SMS reminders at fixed points in time, at the same time, the selected key prevention and control data will be distributed to the community layer by layer, and then the grassroots grid staff will conduct targeted investigations according to big data information to ensure that grassroots epidemic prevention and control work is carried out accurately.