The total*** is divided into 3 steps, 1. Open Alipay, click on the search, click on the anti-epidemic trip card

2. In the national government service platform, click on the trip card

3. Input the cell phone number, select the cell phone number you want to Enter your cell phone number, select the one you want to change, get the verification code, and the travel card will show the status of the changed cell phone number

The principle of the travel code

Using cell phone "signaling data," the user's cell phone is located in the base station location to obtain information about the user's location.

The communications big data trip code is obtained by the China Academy of Information and Communications Technology (AICT) in conjunction with China Telecom, China Mobile, and China Unicom, the three basic telecom companies, by using cell phone signaling data to obtain information about a user's location through the location of the base station where his or her cell phone is located.