Locate Your Lost Iphone

This one is naturally limited to iPhone users only (though the general principle is identical for iPad and iPod Touch owners) and is Apple’s proprietary method of locating a lost mobile. In order to use the service you will need to have updated your iPhone to iOS 5 and set up iCloud over at iCloud.com.
find my iphone   Top 8 Apps & Services For Tracing A Mobile Phone Location [iOS, Android, WP7 & Others]
Once done you can login with your Apple ID credentials and click on “Find my iPhone”. The website will then attempt to locate the device and provide options for playing a sound, sending a message or even locking and remotely wiping the contents of the device.