Fortunately, there are free apps and programs that can help in this situation. With these downloads, your data can remain safe until you are able – hopefully – to track your device down and have it safely back in your possession.
Find My iPhone
Thankfully, you can track your iPhone with Apple's Find My iPhone. It is completely free if you have a new iOS device. To get it for no charge, you need to own an iPhone 4, iPad or fourth generation iPod touch.
With Find My iPhone, you can track your phone using its GPS. Find My iPhone also allows you to wipe your device remotely. This way, even if you are unable to find or recover the gadget, you are still able to delete and protect your sensitive data.