Will the itinerary code change if I have been to Jiangsu on October 1?

Yes, but it takes a certain amount of time. Normally, the itinerary code is updated every 7 days, so the itinerary code will disappear after a few days of visiting places, but it needs to reach 7 days. It will change in 7 days. There have been more than seven days from October 1 to October 14, so the itinerary code for those who visited Jiangsu on October 1 will change. The itinerary code is the abbreviation of the communication big data itinerary card. It is obtained by the Information and Communications Research Institute of China and three basic telecommunications companies, China Telecom, China Mobile and China Unicom, using the "signaling data" of the mobile phone through the base station location of the user's mobile phone. A free query service provided by 1.6 billion mobile phone users across the country. Mobile phone users can use the service to query information about all the cities and towns they have visited in the past 14 days.