4.0, Unlock/jailbreak for Ipod Touch and Iphone

2. Download iOS 4 for your 
3. iPhone 4
4. iPhone 3GS
5. iPhone 3G
6. iPod touch 2G
7. iPod touch 3G
. Place it on your desktop for easy access.
9. Download redsn0w 0.9.5b5-4. It’s available for both Mac and Windows.
• Mac OSX (x86)
• Windows
• Download and install iTunes.
10. Now connect your device to your computer and using iTunes, upgrade to iOS 4 Now press and hold Left “Shift” button on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in iTunes and then release this button.
12. Now that you have iOS 4 final build on your device, you’ll have to jailbreak it by using the iOS 4 with redsn0w 0.9.5 Beta 5. Click browse and point it to iOS 4 firmware and follow the instructions on screen. Remember to enable battery percentage, wallpapers and multitasking. 
14. IPOD TOUCH USERS AFTER DOING STEP 10 YOU ARE DONE. IPHONE USERS IF YOU ARE TRYING TO UNLOCK KEEP GOING BUT IF YOUR JUST JAILBREAKING YOUR DONE.
15. 1. Once you’re done and the iPhone reboots, you should have a jailbroken iPhone.
    2. Now go to Cydia and add the following repo http://repo666.ultrasn0w.com. Check here for how to do this. Search for ultrasn0w 0.9.3 and install it and reboot again. Your iPhone 3G is now carrier unlocked.