Try Prey for Android .

Try Prey for Android. Some features: To trigger it, you send an SMS with specific text (default: GO PREY) Once triggered, starts recording its location to display on your Prey dashboard If "missing" you can put text messages on the screen or cause a loud alarm to be played Here's a recent review: http://www.downloadsquad.com/2010/10/28/prey-for-android-is-an-open-source-anti-theft-service/