Will show the previous information, if you change the cell phone in the cell phone card, that is, what we call SIM card, your trip code will change.

The itinerary card is an effective credential for whereabouts checking, it can show the itinerary of each person for 14 days, as long as they stay in a city for more than 4 hours, there will be a change, but there is a delay in updating the information, usually every other day, it will be seen, and after arriving in a city, if it is a low-risk area will only be shown in green, if it is a medium-high risk areas, it may turn It may turn yellow or red if it is a medium or high risk area.

The trip card will change after 4 hours in a city, except that there is a delay in updating the information, and you will not see the latest trip updates until the next day.

Communication trip card, also known as communication big data trip card, is led by the Ministry of Industry and Information Technology China Institute of Information and Communication, by China Telecom, China Mobile, China Unicom three major carriers to launch the trip query service.

The technology obtains location information through the base station where the user's cell phone is located, providing location query services for cell phone users nationwide. Cell phone card users of the three major carriers can query all the information of all cities and towns visited within 14 days as long as they are using the service.