New York subway riders got an interesting surprise on Saturday night: NYPD officers were handing out fliers at various stops encouraging iPhone users to upgrade their devices to iOS 7, the new operating system Apple released last week.
With Activation Lock enabled, someone who’s found or stolen your device can’t disable Find My [iPhone, iPad, or iPod touch] on the device without knowing both your Apple ID and that Apple ID’s account password. The person with your lost device can’t erase data on the device, either. And best of all, if you designate your device as being lost, whoever is in possession of it can’t restore or reactivate it—the phone displays only a phone number and a custom message about contacting you.
Basically, Activation Lock makes your iPhone worthless to a thief who might attempt to resell it.