I would like to ask, will the travel itinerary code be displayed when the mobile phone card is unplugged?

You can't usually find it. After the mobile phone card is removed, the removed travel track will no longer be displayed. If you insert the card again, you can only find the travel track before the card is pulled out.

The working principle of communication line card is that the mobile communication switch has a position register. After each number establishes communication with the base station, the base station sends the mobile phone number back to the location register of the local exchange of the mobile phone. On the contrary, the location register will record which country and base station the mobile phone is in every time, and the trajectory of the mobile phone is very clear. This is how the communication travel card works.

Personal trajectory query method

First, the query method of telecom mobile phone users

Edit the last four digits of the short message CXMYD# ID number as 1000 1, and then reply Y with authorization to realize "roaming place query", which can query the route information of the mobile phone number in the past 15 days.

Second, Unicom mobile phone users query method

The mobile phone sends "the last four digits of CXMYD# ID card" to 100 10 to inquire about the information of domestic roaming places in the past 30 days, which is convenient for rework and auxiliary investigation.

Third, the mobile user query method

Write CXMYD, send it to 10086, and then enter the last four digits of your ID card according to the reply information, and you can query the provinces and cities (no cities) you have been to in the last month.