Communication big data itinerary card, by the China Institute of Information and Communication Technology in conjunction with China Telecom, China Mobile, China Unicom three basic telecommunications enterprises using cell phone "signaling data", through the user's cell phone is located in the base station location to obtain, for the country's 1.6 billion cell phone users free of charge to provide query service, the service can be used to check all the cities and towns that I have visited in the previous 14 days. Cell phone users can use the service to query all the cities and towns that I have visited in the previous 14 days.