What is Lost Mode on the iPhone?

Lost Mode can be enabled on a missing iPhone, iPad or iPod touch. To use Lost Mode, Find My iPhone must already be enabled on the target iOS device.

Lost Mode will lock the device with a passcode, display a custom message on the screen, and track its location. Lost Mode will also prevent the iPhone from ringing or displaying alerts, notifications or messages.

Click here for instructions on how to enable Lost Mode on the iPhone.