For all of those recommending custom info on the lock screen: what if the battery is dead, or the phone is broken, or the finder has no idea how to turn it on, etc, etc? I used a labeler to make tiny stickers that say "Reward for Return" along with my land line and email address. I had used stuffbak.com before, but saw no reason why anyone would be more likely to call the number of their sticker than mine.