About how can we find a stolen or lost iPhone I said in other articles on iHowTo.Tips.
So far, Apple it has a very good iPhone tracking system. The condition is that the iPhone is not closed (Power Off) or not completely reset. Assuming who found it or stole it he knew code PIN or iPhone unlock password and somehow managed to get it reset completely si to delete all his data from him.
Starting with iOS 15, iPhone will behave like a AirTag. That means the device it can be located even if it is completely closed or has been reset to the factory settings.
The U1 chip present on all iPhone 11 and iPhone models 12 is responsible for locating the devices, having a low energy consumption. U1 it will remain permanently active on the iPhone and will send accurate location data to the owner. It will become quite risky to buy a stolen iPhone.
Many iPhone owners do not know that these devices are registered in the network Apple based on an account. Apple ID or account of iCloud.
When the activate an iPhone, iPad or another device Apple for the first time, it will be automatically added to your list of devices in your account iCloud. Completely resetting a device and deleting all data on it will not remove it from your account. Those who sent devices Apple In an authorized service, I know that before shipping or delivery you must enter the account iCloud and remove the device from "My Devices“. Precisely because if the product is replaced, the old one can be reconditioned and used by another person.
Another feature that will present you on Find My with the release of iOS 15, it will give users the opportunity to be alerted when they leave a device somewhere and leave that place. All we have to do is go to the list of devices from Find My and to activate "Notify When Left Behind” for AirPods, AirTag, iPad or any other device.
About how the network works "Find My" to Apple, you can find more explanations and details in the article: “Lost or stolen iPhone? Find out how you can recover it very easily". The article will require an update as soon as iOS 15 is available to the general public, in the fall of 2021.
