Losing your phone is terrifying. With Find my Phone apps, the anxiety can be short lived. Apple products come pre-loaded with the Find my iPhone app. You can log into your iCloud account from any computer, tablet, or phone and find your phone with the Find My iPhone app.
Android users can download a Find app. There are tons available. The app Wheres My Droid offers a free and paid version with all the features you might want. Android users can also enjoy the Android Device Manager to locate their lost device.
For any Find my Phone application or software, make sure that Location Services/Access is turned on for that app on your phone otherwise you can’t locate anything. Remember to manage what applications have access to your location to protect your data.