The trip code only shows one area, that means only stayed in one area did not go out or turned off the self-location caused.

The data source of the location query service provided by TripCard is "cell phone signaling data", which is obtained through the location of the base station where the user's cell phone is located. In order to ensure communication continuity, achieve coverage without blind spots, and provide better communication service quality, the signals of two base stations at the junction of administrative divisions may be cross-covered, resulting in deviation of the results.

This is possible if the user lives close to the city boundary, or if he or she is driving long distances or traveling by train.

Extended information:

"Big Data Trip Card for Communications "The analysis is "cell phone signaling data", obtained through the location of the base station where the user's cell phone is located, the collection, transmission and processing of signaling data is automated, there is a strict security and privacy protection mechanism, the query results are available in real time, convenient and fast.

The data of the "Communications Big Data Trip Card" can be used nationwide, which can truly achieve comprehensive coverage of the whole country with one network, and can also be used to inquire about the international trips of one's domestic cell phone number.