Will the itinerary code change if the mobile phone is in Foshan and returns to Yunfu?

It will change because the itinerary codes are all authenticated by real-name authentication.

When the mobile phone is turned off, the itinerary card will not be recorded, because the location record of the itinerary card is based on the real-time positioning of the itinerary, and it cannot be located after the phone is turned off.

The itinerary code is the communication big data itinerary card. A code is also equivalent to the health code. It is the data received by the China Academy of Information and Communications Technology in conjunction with China Telecom, China Mobile and China Unicom, the three basic telecommunications companies, using mobile phones. Obtaining the location of the base station is a free query service provided to 1.6 billion mobile phone users across the country.