iPhone Dev Team in Ultrasn0w tweak, now support the development of third-party program called “Ultrasn0w fixer”, and its latest version allows you to unlock iOS 6 for iPhone 4 and iPhone 3GS with old versions of baseband.
Recall, Ultrasn0w fixer does not unlock iPhone 4 or 3GS with the new modem firmware. This solution is compatible with the following baseband:
Ultrasn0w fixer for iOS 6 does not support baseband: 02.10.04, 03.10.01, 04.10.01, 05.14.02, 05.15.04, 05.16.02.
Note: This guide is for iPhone owners to jailbreak iOS 6, which were updated to the new OS while maintaining modem firmware. Jailbreak iOS 6 can with Redsn0w, using the instructions here.
How to unlock iOS 6 for iPhone 4 and iPhone 3GS
Step 1: After the jailbreak iOS 6 is made, you need to install from Cydia package Fix Ultrasn0w. To do this, open Cydia. Touch the Manage, then button Source.
Step 2: Click on Edit and Add. Http://repo.iparelhos.com enter the address and click Add Source.
Cydia will automatically update the specified repository.
Step 5: Click on the Search, to find Ultrasn0w fixer for iOS 6 in your instrument and set up it.
Step 6: Restart your iPhone four or 3GS. Congratulations, you are achieved unlocking your cellphone!