the iPhone Dev Team had released their much awaited software method called Ultrasn0w that can unlock iPhone 3G running iPhone OS 3.0 almost a week back.

Since the release of UltraSn0w, our readers have been asking us for a guide to unlock iPhone 3G.

So here is our step-by-step guide to unlock iPhone 3G using UltraSn0w so that you can use a SIM from any GSM carrier.

As with any hack, please proceed with caution as unlocking your iPhone could void it’s warranty.

Before you begin the unlocking of your iPhone 3G, please go through the following instructions:

1. You must have a jailbroken iPhone. In case, you haven’t jailbroken your iPhone then you can checkout our step by step guide to jailbreak iPhone 3G running iPhone OS 3.0 using Redsn0w for Windows users and this one for Mac users.

You can also checkout our step by step guide to jailbreak iPhone 3G running iPhone OS 3.0 using PwnageTool. PwnageTool offers more customization options to the users compared to the RedSn0w. However, it is available only for Mac users.

2. You must be on 04.26.08 baseband. You can check your baseband (modern firmware) under Settings > General > About > and read the Modem Firmware.

3. If you are on T-mobile then remember to turn off 3G before begining with the unlock

Now, following are the step-by-step instructions to unlock your iPhone 3G running on iPhone OS 3.0:

Step 1: Launch the Cydia App from your iPhone springboard

Step 2: Press the Manage tab at the bottom of the Home-Cydiascreen

Step 3: On the Manage section of Cydia, click on the second option named Sources.

Step 4: Now press the Edit button displayed on the top right corner of the screen.

Step 5: Press the Add button displayed on the top left corner of the screen

Step 6: The screen will display a text box where you have to enter the Cydia/APT URL.
Enter http://repo666.ultrasn0w.com/ as the URL and press theAdd Source button

Step 7: Once this is done, please press the Return to Cydia button

Step 8: Now, press the Done button displayed on the top right corner of the screen.

Step 9: Select the repo666.ultrasn0w.com displayed under the heading Entered by User.

Step 10: Now, press to select ultrasn0w application displayed under the repo.666.ultrasn0w.com

Step 11: Press the Install button displayed on the top right corner of the screen.

Step 12: Then press the Confirm button displayed on the top right corner of the screen. This will install the application.

Step 13: Once completed, you will be able to see the Return to Cydia button. Press this button.

Step 14: As a final step, press the Home button and power OFF and then power ON your iPhone. You can do this by following the sequence:
i. Press the Home button for about 3 seconds
ii. Press the Power button on you iPhone
iii. Move the slider to the right. This will power OFF your iPhone
iv. While keeping the Home button pressed – press the Power button again to power ON your iPhone.

Step 15: You should now be able to insert any SIM card you want in your newly unlocked iPhone 3G!

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