It depends on your cell phone application, because mobile and Unicom are not the same, the mobile to go through 17 days before the track will be queried 14 days.

Recalculating fourteen days from the beginning of the addition. China Academy of Information and Communication Research official WeChat public number "communication itinerary card" today responded that from 0:00 on November 10, 2020, the itinerary card will contain medium and high risk areas of the name of the city marked in red. The red color will be used only as a travel reminder, and will not be associated with health conditions. Specific control policies should follow the joint prevention and control mechanism of each region. As of 10:00 on January 10, 2020, the regions marked with tips are: Kashgar Region in Xinjiang Uygur Autonomous Region, Tianjin City, and Shanghai City. Communication big data itinerary card, by the China Academy of Information and Communication Technology in conjunction with China Telecom, China Mobile, China Unicom three basic telecommunications enterprises using cell phone "signaling data", through the user's cell phone is located in the location of the base station to obtain, for the country's 1.6 billion cell phone users to provide free query services, cell phone users can be used through the service, query the first 14 days of the person's visit to all the cities and information. The cell phone user can use the service to check the information of all the cities and towns that he/she has visited in the previous 14 days.