1. On a 1.1.1 phone, open Installer and install OktoPrep located in the Tweaks 1.1.1 category.
2. Download the 1.1.2 firmware file from Apple: iPhone1,1_1.1.2_3B48b_Restore.ipsw (right click link and save target)
3. Connect your phone to your computer and open iTunes on the "summary" page.
4. Hold down the SHIFT key (Windows) or Option/ALT-key (Mac) on your keyboard while clicking on the Upgrade button (not the restore button!). A file browsing dialog should appear, and you must select the firmware file you downloaded in the previous step.
5. While the phone is upgrading, download the 1.1.2 jailbreak archive and extract the files to your computer.
6. If you don't already have Java on your computer, you need to download and install Java runtime first. If you are unsure, check the jailbreak.jar file in the archive you extracted previously - it should have an icon with a coffee cup
7. When your phone is done upgrading, and shows the Slide for emergency screen, you need to launch the jailbreak java application on your computer. Windows users double click on the windows.bat file, while Mac users can double click on jailbreak.jar file.
8. An application should appear, with a "Jailbreak" button - click on it and wait while it's jailbreaking. This will take a few minutes, and your phone will restart a few times at the end.
9. Your phone should now show "Slide to unlock" instead of emergency. If it does, everything was successfull.

If are going to use TurboSIM or a similar SIM-adapter you don't need to unlock - it should work right away. If your phone did not have 1.1.2 when you bought it (old bootloader), you can unlock it to work with any sim-card. To do so, install anySIM 1.2.1u located in Utilities category. Open Settings enable Airplane Mode (very important!) (and set Auto lock to never if you haven't already) and then you can launch anySIM and follow the instructions shown.

Important: 1.1.2 has a bug that causes phone/SMS to crash when used in foreign countries. To fix this, you must Install and run iWorld found in the Tweaks (1.1.2) in Installer. Run the application and select your country. When phone has rebooted you can uninstall iWorld.

Article from http://iphone.unlock.no

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