Well, here is a free mobile software that you can use. Its called mGuard, from
mGuard keeps track of the SIM changes of your device by sending SMS notifications to a predefined mobile number selected by the user.The targeted secondary number to which the SIM change notification has to be sent can be the owners secondary no. or a friends no.
To Download this free software visit http://www.getjar.com/mobile/12396/mguard-theft-recovery/ or register here
A detailed PDF User manual is also available.
For more info visit http://www.vapssky.com/