Henan numbers will become Hubei trips within 14 days of the Hubei Telecom trip code. The code will usually record a visit to a certain place after 4 hours. If the user stays in a city for less than 4 hours, there will be no tracking. If a cell phone user stays in a city for more than 4 hours, it will generally be located by the mobile terminal and recorded in the big data.

Introduction and significance of the trip code

Communication big data trip card, by the China Academy of Information and Communication Technology in conjunction with China Telecom, China Mobile, China Unicom, three basic telecommunication enterprises to use the cell phone signaling data, through the user cell phone is located in the location of the base station to obtain, the country's 1.6 billion cell phone users free of charge to provide the query service, the cell phone user can be Through the service, the mobile phone users can inquire about the information of all the cities and municipalities that they have visited in the previous 14 days.

As of March 25, 2020, the cumulative number of inquiries has exceeded 4.5 billion. Starting from 20:30 on January 8, 2021, the trip card will no longer mark the names of cities and municipalities containing medium- and high-risk areas in red, and will change to include medium- and high-risk areas in the parentheses after the name of the city, which will only serve as a travel reminder and will not be associated with health conditions.

March 30, 2021, the national government service platform anti-epidemic health code has been integrated with the communications big data trip card information, can be displayed in the health code users, whether they have been to the medium and high risk areas and other trip information, to help the health code a code pass.