If you haven't turned on "Find My iPhone", you probably should
So, the parental unit (heretofore known as Mom) works in a wireless call center, and with my past experience and what she tells me, people just get dumber the smarter their phones become. First, if you have an iPhone, iPod Touch (with location capabilities), or an iPad 1 or 2, you need to know about something called Find My iPhone. Well first its an app, and yes its free, you need to download and install it ASAP. This is not a way for you to get some type of Batman/Daredevil vigilante justice, but a high tech lowjack for your phone/pad/pod. The most important thing, you have to have it set up first before it will work...so you can't lose your phone and then decide to turn it on. Second, if you have iOS 5, and your using the cloud, its really easy, make sure to toggle the switch in your settings to turn on find my iPhone. Once this is complete you can login to your iCloud account and then select find my iPhone and it will find all your iOS devices assigned to your cloud login.
Once your here, you can send a message/sound to the device, lock it remotely, or wipe it out entirely. What is cool is you will get a map showing you pretty close to where the device is. This is handy if you can't find your device in the house, or someone has stolen it. The key to a stolen device is let law enforcement know you have a stolen device, and that you have tracked its whereabouts and provide this to them, they may or may not go get it, but at least you've gotten them closer than they used to be when things were stolen.
So thats find my iPhone, please use it, it will save you countless hours of problems and issues, also use your cloud space, back up your contacts, and for god sacks, sync your damn devices regularly.