My friend just lost his Desire at an airport. The pattern lock is active, but that does nothing but protect the data on the phone - Not SD. The first thing they would do is to switch the phone off and replace the sim. Now here is my question : Is there an app that will send an sms to a preallocated number if the phone is booted up with a different sim? I know some Samsung phones can do this. But having an app that requires your own sim to be able to find it if stolen is quite pointless.