Along comes iOS 4.2.1 and with it come the great feature of MobileMe, and what makes it greater is the fact that its free. Find My iPhone, iPad or iPod Touch is the feature that allows you to locate your missing device, remotely set a passcode lock from your computer and even remotely wipe the data from your device to protect yourself. The device will be displayed on a map for easy location.
Once you download iOS 4.2 the feature is easily activated on your device. To know how to Apple as help us out with that. For set up click on your relevant device, iPhone, iPad and iPod Touch.