Wheres My Droid is the app you need if your phone gets lost or is stolen. Absolutely a very useful and great app. Where's My Droid can turn the ringer volume up and make your phone ring. I lost my phone while snowboarding.
Open your device's Settings app. Product version Varies with device All versions. I used Where's My Droid and the ringing feature allowed me to find it in the snow. If so follow the workaround at the bottom of this page. How to remove apps that you installed on Android. It's Apple's venerable Find My iPhone.