It doesn’t work when she comes back from overseas and uses my local itinerary code.

It is not easy for her to use my local itinerary code when she comes back from other places, because she needs to use her own itinerary code, for the sake of others and herself.

The itinerary card is also called the itinerary code. The official name is the communication big data itinerary card. It is an itinerary inquiry service jointly launched by the China Academy of Information and Communications Technology, China Telecom, China Mobile and China Unicom under the guidance of the Ministry of Industry and Information Technology. It can provide users with proof of the countries, regions and domestic cities they have visited in the past 14 days for free.