Communication Big Data Travel Card is a free inquiry service for 654.38+06 billion mobile phone users nationwide, which is obtained by China Xintong Institute, China Telecom, China Mobile and China Unicom through the location of the base station where the user's mobile phone is located. Through this service, mobile phone users can query all the city information they have been to in the previous 654.38+04 days.
In order to help people travel safely, the national government service platform integrates the health code and the travel code, and opens Alipay's health code to see the travel code at the same time. This means that the health care law and the travel law are completely integrated in the whole country.