How does the airport confirm the residence history?

The airport confirms that the travel code can be used in China.

"Communication Big Data Travel Card", referred to as "Travel Card" for short, is a travel inquiry service jointly launched by China ICT Institute, China Telecom, China Mobile and China Unicom under the guidance of the Ministry of Industry and Information Technology, which can provide users with free certificates of countries (regions) and domestic cities that I have visited in the past 14 days (staying for more than 4 hours).

With the close contact reminder function of Bluetooth, if a stranger who has had close contact with you is diagnosed as a confirmed/suspected patient in COVID-19, using our service will remind you to pay attention to isolation observation more timely.

Featured services:

1. Safe and reliable: the "Travel Card" service needs my authorization and SMS verification. Do not collect any additional information, such as ID number and home address.

2. National coverage: The data of "Travel Card" covers the whole country, which is universal and not restricted by provinces and cities.

3. Simple operation: users only need to scan the QR code or enter the WeChat applet, enter the mobile phone number and verify the SMS.

4. International features: Before the mobile phone number, you can check the national itinerary of China within 14 days.

5. Dynamic update: every day, new calculations and processing will be carried out, including the latest itinerary of users.

6. Objective and accurate: The "Travel Card" service is based on personal mobile phone signaling data, and the calculation and processing are carried out in the background of the operator, which is relatively true and accurate.