The PwnageTool for Mac OS X have been released now and you could use to jailbreak your iPhone 3G on iOS 4.1 while preserving the baseband so that you could unlock iPhone 3G 4.1 iOS. The old version of Ultrasn0w, that is version 1.1-1 could be used to unlock iPhone 3G 4.1 iOS. Here are the steps to do it.
How to Unlock iPhone 3G iOS 4.1
1. Jailbreak iPhone 3GS on iOS 4.1 using the guide given here.
2. Launch Cydia.
3. Choose the ” Manage ” tab at the bottom.
4. Choose the ” Sources ” option.
5. Tap the ” Edit ” button and then on the ” Add ” button.
6. Then add the source ” http://repo666.ultrasn0w.com “.
7. After the source is added, search for ” ultrasn0w 1.1-1 ” in Cydia.
8. Install the Ultrasn0w 1.1-1 app to unlock iPhone 3GS 4.1 firmware.
9. Restart your iPhone 3GS.
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