The trip code can be accurate to the district. The Big Data Traveler's Card can only look up information on all the cities and towns that the user has visited in the previous 14 days, and cannot pinpoint which city or province the user was in at any given moment. Big Data trip card through the user's cell phone is located in the base station location to obtain the user's location information to the national common, truly a national network of comprehensive coverage, but also can query my domestic cell phone number of international trips. As the service uses base station data, in order to ensure continuous communication and achieve coverage without blind spots, the signals of the two base stations at the junction of administrative divisions may be cross-covered, resulting in deviations in the results, which can be adjusted accordingly when used in conjunction with other proofs.

Generally, if you stay at an address for more than 4 hours, the trip code will be recorded. The working principle of the travel code is to analyze the cell phone signaling data and call data to determine which city we have been in, and which city's base station has been in contact with, in the process of using the phone, whether it is a call, text message or Internet access, you need to be connected to the base station inside, and the specific information of each base station, including the location of the number, the operator is very clear that, once you are in a certain place to access the Internet or make a phone call will have contact with the local base station, and the operator will not have any contact with the local base station. The new technology will also allow you to use your phone to connect to a cell phone that is not connected to the Internet.