System: IOS15.5
Software Version: WeChat 8.0.26
Pull down the cell phone card, the trip data will not be displayed, because the communication big data itinerary card needs to provide location query service through the signaling data of the cell phone, and after the user shut down and take out the cell phone card, the base station can't obtain the location of the cell phone through the network, so it is not possible to query the whereabouts of the track. After the user turns off the phone and removes the card, the base station can not get the location of the phone through the network, so it is not possible to query the whereabouts track.
Communication big data itinerary card analysis is "cell phone signaling data", through the user's cell phone is located in the base station location to obtain, signaling data collection, transmission and processing automation, there is a strict security and privacy protection mechanism, the query results in real time available, convenient and fast. However, the cell phone base station positioning needs to be based on the communication time difference between the base station and the cell phone to calculate the user's current approximate location (not the exact location), so when the cell phone is turned off, or at that time in the signal strength of the area is weak, there is no way to query.
When the phone is turned on, it automatically searches for nearby cell sites and selects the one with the best signal. Through each base station to detect the received signal parameters, such as signaling data and billing data, as well as the signal arrival time, signal strength and other information, you can determine the location of the phone. Stay more than four hours it, this time the base station will record your trip information, the operator through this information, you can clearly know the track of our trip. Then these data are uploaded to the trip code system, so you only need to scan the code to see where you have been in the last 14 days.
Trip codes come in red, orange, yellow, and green. Red: The red color of the trip code represents a person with confirmed or suspected C.N.C. pneumonia. Orange: The trip code is orange and represents a close contact of C.pneumoniae. Yellow: A trip code of yellow represents a visit to a medium-risk area. Green: A trip code of green means that you are in a safe environment and are not a suspected or close contact of CKP.