The address on the trip code shows where you've been in the last 14 days, and the area that the trip code displays is based on the location of the cell phone's communication signal. The display not only requires the use of a local cell phone base station, but also the use of a local network or call for more than 4 hours. If you are at the junction of two provinces, you may have a situation where the display area of the trip code is not consistent with the area where you are located, which can only be avoided by setting your phone to airplane mode or turning it off.