Find My iPhone is a built-in feature on iPhones that allows you to locate your lost or stolen device. This feature uses the device's GPS and internet connection to pinpoint its exact location on a map. With Find My iPhone, you can also remotely lock your device, play a sound to help you find it, or even erase all of its data to protect your personal information. This guide will walk you through the steps to enable Find My iPhone on your device and how to use it to locate your lost or stolen iPhone.