iPhone Dev Team has now been updated to version 1.2.2 supports ultrasn0w Open for 4.3.2 iPhone and iPhone 3G IOS 4 This underlines once again that this does not open new baseband, it must know how to unlock baseband 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00.
Note: Users 4/3GS iPhone baseband 5.14.02, 5.15.04, 5.15.04, 5.16.01 and 5.16.02, 2.10.04, 3.10.01 to open 04.10.01.can 't already open the Dev Team is working and when it is ready to tell you.
Important: You must ensure that the iPhone 3G, running BB 5.14.02 or 5.15.04 should upgrade to 6.15.00. Follow here to upgrade your baseband.
So, before you open the device, you must make sure your device is successfully jailbroken 4.3.2 is Ios. If you've jailbroken your device, you can follow here Sn0wbreeze Jailbreak (Windows) or you can follow here for Redsn0w (MAC) Jailbreak
Lets start with unlocking your iPhone, simply follow the steps:
Step 1: First of all Go to "Cydia" then "Manage Tab"
Step 3: Now Write,
http://repo666.ultrasn0w.comAnd then click "Add Source"
Step 4: Once the Repo has been added, Just search for "Ultrasn0w" in Cydia and Install it.
Step 5: Click Install, And then Restart your iPhone.
Enjoy, It's Unlocked!