Is there a record of the mobile phone flight mode to the epidemic area?

The trip code is recorded through the base station information of the mobile phone, and it will be recorded as long as it stays in the local area for more than 4 hours, even if it is turned off or in flight mode.

Communication Travel Big Data Card (Travel Code) is a public inquiry service jointly launched by China ICT Institute, China Mobile, China Telecom and China Unicom under the guidance of the Ministry of Industry and Information Technology. I can provide users with free domestic city certificates of countries and regions I have been to in the past 14 days for 4 hours.

The travel card analyzes the signaling data and bill data of the mobile phone (connecting 3G, 4G and 5G networks, sending and receiving short messages, answering incoming calls, making calls, etc.). ). Therefore, the premise of having trip data is that users generate these signaling and call list data in the process of using mobile phones. Judging from the way this data is generated, the data generated by the travel card may be inaccurate if the following situations occur. 1, I didn't bring my mobile phone during the trip; 2. Turn off the phone all the time; 3. WIFI connection throughout the journey, no texting, no dialing, and answering incoming calls; 4. Passing through a place and staying in one place for no more than 4 hours (sometimes after only two minutes, there will be user feedback, which will be displayed on the travel itinerary).