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Say you’ve just used Find My iPhone, and it turns out you left your iPhone at the doctor’s office. You can write a message and display it on your screen. Something like, “Oops, left my iPhone behind. Please call me at 408-555-0198.” Your message appears, even if the screen is locked. And if the map shows that your iPhone is nearby — perhaps in your office under a pile of papers — yet you still can’t find it, you can tell Find My iPhone to play a sound that overrides the volume or silent setting.

People misplace things all the time. Fortunately, if you lose your iPhone, Find My iPhone can help. It’s a feature that’s part of MobileMe, but now it’s also free on every iPhone 4 with iOS 4.2 or later.* Enable Find My iPhone in Settings. Then if you misplace your iPhone, you can sign in to me.com from any computer web browser or using the Find My iPhone app on another iPhone, iPad, or iPod touch to display its approximate location on a map.

Addresses, phone numbers, email, photos. Your iPhone contains important and personal information — information you probably don’t want in the hands of a stranger. So if you lose your iPhone and displaying a message on it hasn’t resulted in its safe return, you can initiate a remote wipe to restore it to its factory settings. If you eventually find your iPhone, just connect it to your computer and use iTunes to restore the data from your most recent backup.