It can send SMS to a preselected number from the new SIM card number, to notify you, and also can include the location of your phone.
You can also make it ring or lock it when SIM card is changed after upgrading to Pro!
You can use it with Lost Offline app, so if your phone was stolen and the SIM card was changed, you'll know the new number and then you can continue using Lost Offline to get your phone!
Users who purchased Lost Offline Pro can upgrade SIM Chnaged! to Pro for free!