Passing the big data card is based on the user's cell phone signaling data to provide location query service, with the Bluetooth location information is not much to do with the nature of the information, that is, cell phone carriers have a signal in place to query the place that has been there, but part of the region if there is a cell phone signal value is weak or no signal will be biased, there may be The places that have been visited are not shown in this case. Passage of big data card through the user's cell phone is located in the base station location to obtain, signaling data collection, transmission and processing process is highly automated, and there is an extremely stringent security and privacy protection mechanism, has a high degree of authenticity and accuracy. The general ride time is only a few hours will not be judged as stationary, as long as there is no more than 4 hours will be fine, so you can rest assured that everyone on the train, high-speed rail, airplanes can ride.

The reason why the pass big data card can't find out where you've been 1, stopping to stay is not more than 4 hours, and the pass big data card doesn't record it 2, stopping to stay in a place where the signal is not good, the cell phone doesn't have a signal, it's not a three major carriers' coverage area, and the cell phone signaling data is out of order.