Find My, which Apple offers as a free service, helps to block lost or stolen phones.
Lost mode  flags the device as lost or stolen, allowing the user to lock it with a passcode. If the device is an iPhone and someone finds the device, they can call the user directly on the device. Find My is an app and service provided by Apple Inc. that enables users to track the locations of iOS, iPadOS, macOS, watchOS devices and AirPods, a function formerly provided by the app Find My iPhone, and to share their GPS locations with others with Apple devices, a function formerly provided by the app Find My Friends. 
