Security Genius

Now this is an app that I will buy. Once installed the app is invisible on the phone. If you lose your phone and the finder changes the SIM, a customised SMS is automatically sent to pre-defined mobile numbers. My only concern, I regularly change SIM myself, flicking between phones and SIM's, also when in Italy I use a local Italian SIM. As long as the app can be disabled to allow me to do this, then I'm sold.