In iOS 13, the company combined the applications Find Friends and Find iPhone into one – Find My.
The main innovation was the ability to search for a lost turned off iPhone without the Internet. The smartphone transmits the signal via a Bluetooth beacon to another Apple gadget, which is nearby.
This creates a local encrypted network to search for a lost device. All data on the location of the device will be transmitted through another gadget connected to the Internet. [MacRumors]
Download iOS 13: direct download links