Services like OnStar, MyLink, etc. are great... but if you don't have them available in your car, this application will help you out. This program watches your phone for sudden movements, and if it's jostled, your location will be sent to a phone number of your choice via an SMS text message. Best of all, there is NO monthly service charge to use the software. The program works best with GPS running so we can calculate your exact location (instead of estimating by using nearby cell towers). If GPS is off, you must have network data on so we can figure out your location based on cell tower positioning. NOTICE: On some phones, the manufacturer locks the accelerometer when the phone is locked/goes to sleep. If your phone does this, then this app will work for you only when the phone is active (we cannot override the settings on your phone).