Will Sprint Family Locator make a sound to help me find a lost phone?
Unfortunately, Sprint Family Locator cannot make your phone ring or sound an alarm if lost. However, if you have an Android you can use Android Device Manager to make your phone ring. You'll need to log into the Google account attached to the device, but I've used it. Works great. You can also use it to lock or wipe your phone if it's lost or stolen: Android Device Manager
If you have an Apple device you can use Find My Phone to make your phone ring from a computer or associated Apple device like an iPad. If you have activated Family Sharing, you can also make a phone associated to your family account share. Simply follow the directions in the article on Apple's Support site