I've heard about apps that allow you to track your phone if lost or stolen. Some can even make sure the ringer is on full to help you find it. Some can also lock the screen so the thief or someone who finds it cannot use it, until you find it and type in a code. I searched a little and found a bunch of different options. Opinions for those that have used them? That have all the features I listed above? Especially being able to turn the ringer on, as I frequently have it on vibrate.