The itinerary code of the city I left on March 9 is not displayed

At least the 23rd.

Itinerary Code, the full name is "Communications Big Data Itinerary Card". This service is launched by the China Academy of Information and Communications Technology of the Ministry of Industry and Information Technology in conjunction with the three major telecom operators. Through the big data of the three major operators, it provides 16 Billion mobile phone users provide form query services. The query method is very simple. You only need to enter your mobile phone number and verification code, and you can query all the itineraries within 14 days with one click. All cities where you stay for more than 4 hours will appear on the itinerary, even if you are overseas. The country will also appear on the schedule, it is so powerful. As for cities where the stay time is less than 4 hours, the system will automatically determine it as passing through and will not be recorded on the itinerary.

Some base stations are obvious signal towers that can be seen at a glance, and some base stations are good at disguising themselves, making themselves into lightning rods or disguised as a tree. The purpose of this is to silence some people who are overly concerned about their health and believe that the radiation from signal base stations is too strong and will affect their health. In fact, this worry is unnecessary, but operators The base station is still camouflaged. When we travel through different cities, our mobile phones will connect to different signal base stations, and our own location information will also be exposed.

To give a common example, friends who often travel on business know that when we just leave one province and enter another province, we will receive a text message, such as Henan Mobile welcomes you, Anhui Mobile welcomes you Something like that. When we receive this text message, we know where we have arrived. This is base station positioning.