How does Guangdong province save trouble applet scan code into travel card?

Guangdong province's small program scanning code into the field has become a travel card, which is the design of small programs. Communication big data travel card, commonly known as "travel code". China ICT Institute, together with China Telecom, China Mobile and China Unicom, obtained the location information of the base station where the user's mobile phone is located by using the "signaling data" of the mobile phone, providing free inquiry service for the 654.38+06 billion mobile phone users nationwide. Mobile phone users can query all the city information they have visited in the previous 654.38+04 days through this service. A travel card will appear when scanning the code of Guangdong province's small program.