Unlock iOS 4.3.1 on iPhone 4, 3GS Using Ultrasn0w [How To Guide]

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The newly released Sn0wbreeze 2.4 supports Ultrasn0w unlock for iPhone 4 and 3GS users (old basebands only) which otherwise happens to be broken on the latest iOS 4.3.1 firmware.

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If you have jailbroken your iPhone 4/3GS (old basebands only) on iOS 4.3.1 using Sn0wbreeze 2.4, and you rely on an unlock, you can use Ultrasn0w to unlock your iPhone on this latest firmware so that you can use it on any carrier you like.
The following step by step instructions will help you jailbreak and unlock supported iPhone 4 and 3GS running on iOS 4.3.1. However before we proceed, please make note of the following:
Sn0wbreeze 2.4 supports Ultrasn0w unlock for basebands (01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00)
ultrasn0w is NOT compatible with the following basebands (02.10.04 / 03.10.01 / 04.10.01 / 05.14.02 / 05.15.04)
iPhone 3GS users can upgrade to 06.15.00 baseband now under Unlocks section in Expert.
Upgrading iPhone 3GS baseband to the 06.15.00 iPad baseband hack to unlock MAY cause you to lose your GPS!
There is NO unlock for the stock iOS 4.3.1 (latest baseband) yet. If your iPhone relies on a unlock, DO NOT update to stock iOS 4.3.1 yet.
Sn0wbreeze is a tethered iOS 4.3.1 jailbreak for iPhone, iPad and iPod touch.


COMPLETE PROCEDURE