When you stay in a place for more than 4 hours and turn on the trip code on your cell phone, the system will automatically record it as a pass through or visit.

The "Communication Big Data Itinerary Card" service uses base station data, and in order to ensure continuous communication and achieve coverage without blind spots, the signals from two base stations at the junction of administrative divisions may cross-coverage, resulting in deviation of the results. In addition, if you stay in a city for less than 4 hours, you will not be recorded.