Losing an iPhone can be a traumatic experience, especially if you recently paid money for a new one. But circumstances needn’t be so dire with the help of iCloud and the iPhone's built-in GPS – if you’ve taken the proper precautions.
After you’ve set up iCloud, go into the iCloud settings and enable Find My iPhone. You can also just download the Find My iPhone app. Once signed up, you can track your phone on a map. From there, you can remotely force the phone play a sound, lock down the phone, have it display an alert message, or even wipe its memory. Of course, this might not be necessary if you can find it via the GPS tracker. Just hope it doesn't run out of battery power... or lose service.