GPS positioning requires hardware module support, battery support, and at the same time requires the software to be turned on in order to complete the positioning. So usually when the phone is turned off, all these supports are turned off, and naturally you can't locate the phone.

The same is true for wifi, which requires a network connection. When the phone is turned off, it can't connect to any wifi signal, so it won't be tracked anymore.

Generally, cell phones are set up so that they won't be connected to the Internet after they're turned off, so they can't be tracked or located by either of the two methods mentioned above. This is not necessarily the case with base station location. If you just turn off your phone and don't remove the SIM card or remove the battery, it's likely to be tracked as well.

Communication big data trip card will directly display the user within 14 days of all the cities that have been stationed, does not show 14 days before the trip information, although does not show, but does not mean that the operator's data backstage will be directly deleted, in the app or small program can not be found in 14 days before the trip, but the operator in the backstage can still be found.

Communication big data itinerary card through the user's cell phone is located in the location of the base station to obtain, query my previous 14 days to all the cities and towns information. 20:30 on January 8, 2021 onwards, the itinerary card will no longer contain high and medium-risk areas of the name of the cities and towns marked in red, to change to the name of the city after the parentheses note contains high and medium-risk areas, the note is only as a travel reminder, not associated with the The note is only a travel reminder and is not related to health conditions.