Some friends may wonder, the phone is clearly turned off, but when it is turned on, the trip code still shows the trip trajectory when it is turned off. Why is this?
The itinerary code is a communication big data itinerary card, which was jointly launched by China Academy of Information and Communications Technology and Communications Technology and three major operators. Earlier, the itinerary card was able to check the city information that the owner had arrived within 14 days. After adjustment, the itinerary card can currently check the city information that the owner had arrived within 7 days. Through the itinerary, you can determine whether the mobile phone user has been to high-risk areas for the epidemic, and thus take corresponding epidemic prevention measures.
The trip code can use the base station location of the mobile phone to receive data, and it can track the itinerary of the mobile phone user throughout the journey.
The base station sends and receives messages through an antenna, which can ensure that mobile devices such as mobile phones are connected to signals anytime and anywhere, and realizes normal calls, Internet access and other functions. Operators all have their own base stations, and the base stations are widely distributed. By detecting different base stations connected to the mobile phone, operators can determine the location of the base station, thereby determining the province and city where we are located, and recording the obtained data information to the background. Even if the phone is set to flight mode or even unplugged the phone card, the phone will still interact with the base station, and the corresponding location information will be monitored by the operator.
In addition, there is a positioning device installed in the mobile phone. With this device, the mobile phone can still be positioned in the shutdown state, and the corresponding position information is recorded.
So, after the phone is turned off, the itinerary code can still be "find" us.
Finally, I remind everyone that we must strictly abide by the epidemic prevention requirements of all localities and cooperate with staff to do a good job in querying and registering health code and itinerary codes.
(Source: Popular Science China)
