Trip code is the "signaling data" of mobile phones used by China Information and Communication Research Institute, China Telecom, China Mobile and China Unicom.
Through the location of the base station where the user's mobile phone is located, it provides free inquiry service for 654.38+06 billion mobile phone users nationwide. Through this service, mobile phone users can query all the city information they have visited in the previous 654.38+04 days. In September of 20021year, in order to help people travel safely, the national government service platform integrated the health code and travel code into one page, and opened Alipay's health code to see the travel code at the same time. This means that the health code and travel code have fully realized a page of "two in one" nationwide.