Unlocked iPhone v 1.1.2 Bootloader 4.6 with X-Sim
Thursday, 01.03.2008, 05:42pm (GMT+7)
X-Sim from China and Vietnam
Below is the experience I got:
1. Downgrade to 1.1.1. (a lot of threads in the forum telling you how to do it)
2. Jailbreak the phone using jailbreakme.com. This step is a bit discouraging, and it took me over ten times to do it successfully.
3. Install OkToPrep from installer.
4. UPGRADE to 1.1.2.
5. Jailbreak the phone with 1.1.2 jailbreaker.(Need to install Java first.)
5. iWorld (format of your country.)
6. Swap your sim attached with X-sim
7. insert all your iPhone
Reboot that Ok.
Check here