Find My iPhone is the anti-theft software made by Apple.But in order for Find My iPhone to work at all it must already be installed on your iPhone
Using a computer or smartphone, go to Find My iPhone on iCloud.com.
After you have logged in, find the Find My iPhone button and click it.
At the top of the screen you’ll see the label “All Devices”. Click it.
From the drop down menu select your stolen iPhone
The iPhone info window will pop up. Here you’ll be able to see how long ago the iPhone last checked in. You’ll also find three buttons below that: Play Sound, Lost Mode, and Erase iPhone.
Play Sound will allow you to activate the iPhone to play a sound. This is only really useful if you lost your iPhone somewhere around the house, not if it’s stolen and in another location.
Clicking Lost Mode will prompt you to enter a phone number where you can be reached. This phone number will then be display on your stolen iPhone’s screen. You can also enter a message that will be shown on your stolen iPhone’s screen. But both of these options are more for lost iPhones rather than stolen ones. It’s not like the thief will be ringing you up to tell you he has your stolen iPhone (unless he wants a ransom). But Lost Mode does one other thing: it automatically locks your iPhone, which means the thief can’t get into it even if you didn’t have a passcode set before it was stolen.
Erase iPhone is a last step nuclear option that should only be used if the information on the stolen iPhone is more valuable than the iPhone itself. If you proceed with Erase iPhone all the iPhone’s content and settings will be erased, which prevents the thief from hacking into the phone to get your info, but then the iPhone will not be able to be tracked or located anymore.
Click All Devices. (Next to the device you’ll either see a green dot or grey dot, the green dot means it’s online, while the green dot means it’s offline)
Select the device you want to locate.
Then you can either update the location of your iPhone, zoom in and out of the map or change the view of the map.
