How did China's mobile phone number go to which cities?

The station usually has a QR code, just scan it. There is also a WeChat search for the State Council, then go in and click on the epidemic prevention itinerary card, enter your mobile phone number, and then verify the code to know which cities you have been to in 14 days. If you want to know which cities you have been to since this number was used, see if you have used Baidu map or Gaode map, which contains footprints. You can have a look.