March 05, 2012, 6:23 PM — Here's how you can turn on Find My iPhone in case you lose your phone.
1. Open the Settings app.
2. Go to iCloud.
3. Scroll down to the Find My iPhone section and make sure the switch is toggled to On.
Find My iPhone might come in handy if you lose your iPhone someday. Why wonder where it is when you can easily locate it instead? Why indeed!