Find the Owner of Your Lost IPhone With Siri
If you’ve ever found a random iPhone with a passcode, there isn’t much you can do to get it back. However, OS X Daily indicates that you can simply ask Siri for help.
You have two ways to ask Siri to help you find the owner: “Whose phone is this?” or “Who owns this phone?” Siri will then display their phone number, address, and email for you to try to get them. It seems much easier than tracking your IMEI number. Of course, if you don’t like the fact that all this information is available on the lock screen that any old identity thief can see, you can turn off Siri completely (Settings> General> Siri).
Found someone’s iPhone? Help Siri Get Your Lost iPhone Back | OS X Daily