This application will use a buffer-overflow exploit to unlock (remove the SIM lock) on an Apple iPhone 3G. You must run it every time the phone boots, and works on firmwares up to 02.28.00 (iPhoneOS 2.1).-This application will use a buffer-overflow exploit to unlock (remove the SIM lock) on an Apple iPhone 3G.　 You must run it every time the phone boots, and works on firmwares up to 02.28.00 (iPhoneOS 2.1).