I just tested an app called 'Wheres My Droid'
basically if you text a 'code' to your number with someone elses phone (this is if you lose phone), then the phone you used to send the message with will get the link for google map with the location of your map and the address etc..
However if my phone gets stolen and the offender changes the sim im guessing the whole point of the app turns to custard :)
can anyone actually suggest me a good app so that i can track it down when it does get stolen??