If you have your iPhone 1.1.2 locked, then the simplest way to unlock it is by using the Turbo SIM. It is very easy, just prepare yourself your SIM card, the turbo SIM and a pen knife. After that, cut your SIM card according to the turbo SIM IC chip. Then, place your SIM card together with turbo SIM and put in to your iPhone. Finally, your iPhone is unlocked.