The 14-day no-away certificate can be obtained through the Communications Big Data Trip Card service.

In order to help people conveniently prove their trips, improve the efficiency of trip checking for enterprises, communities, transportation departments and other organizations, and accelerate the process of resuming work and production, the State Council client applet is online with the Communication Big Data Trip Card for Epidemic Prevention and Control launched by the Information and Communication Administration Bureau of the Ministry of Industry and Information Technology (MIIT).

Using the communication big data of China Telecom, China Unicom and China Mobile, the three basic telecommunication enterprises provide itinerary query service for 1.6 billion cell phone users nationwide. It supports one-click inquiry of countries (regions) and domestic cities visited within 14 days (with a stay of more than 4 hours).

Technology Principle

"Communications Big Data Itinerary Card" analyzes "cell phone signaling data" , obtained through the location of the base station where the user's cell phone is located, signaling data collection, The signaling data collection, transmission and processing processes are automated, with strict security and privacy protection mechanisms, and the query results are available in real time, convenient and fast.

The data of the "Communications Big Data Travel Card" can be used nationwide, which can truly achieve comprehensive coverage of the whole country with one network, and can also be used to inquire about the international travel of one's domestic cell phone number.

These will provide scientific and accurate technical support for the prevention and control of epidemics, the resumption of work and production, road traffic, and entry and exit, under the premise of ensuring the security of user information.

The data source of the location query service provided by the trip card is "cell phone signaling data", which is obtained through the location of the base station where the user's cell phone is located. In order to ensure continuous communication, realize coverage without blind spots and provide better communication service quality, the signals of two base stations at the junction of administrative divisions may be cross-covered, resulting in deviation of the results.

This is possible if the user lives close to the city boundary, or if the user drives long distances or takes the train.

Reference for the above:

Baidu Encyclopedia-Communications Big Data Itinerary Card

People's Daily Online-How can I check and prove my 14-day itinerary? The Ministry of Industry and Information Technology (MIIT) has launched an online service