The school asked to see the trip code or health code, which shows every place you went with your cell phone.

The trip code is the communication big data trip card, as a travel track record vouchers, is an important means of epidemic prevention and control, "trip code" can show the user in the past 14 days to visit the country (region) and the domestic stay of more than 4 hours of the city information, can be used to prove that the person in the past 14 days there is no key The "code" can show the user's past 14 days to visit the country (region) and the domestic stay of more than 4 hours of city information, can be used to prove that the person has not been in the past 14 days to the key epidemic areas and countries.