Jailbreak and get the real Anti-Theft solution; iCaughtU Pro. It's not a service (so no additional monthly bill) and does a lot more than ANY AppStore app could ever do (that's cause it's got root access). With this so-called prey service, you're out of luck with 1 attempt of the thief to turn of your device (which they are 99.9% of the time goingto do).