Procedure to Unlock iPhone 3G on 4.0 Firmware Using Ultrasn0w

Written By Sam on 17 April 2010

If you are having a iPhone 3G with the latest iPhone OS 4.0, then you can use ultrasn0w to unlock it so that your iPhone can use it with any carrier. But before unlocking your iPhone, you should jailbreak it. You can use ultrasn0w to unlock iPhone 3G if your baseband is 04.26.08.

To jailbreak iPhone on 4.0 firmware, you can use Redsn0w 0.9.5. After downloading Redsn0w 0.9.5 you can read this “Tutorial To Jailbreak iPhone 3G on 4.0 Firmware With Redsn0w 0.9.5“. Once you are successful with Jailbreaking your iPhone on 4.0 Firmware, you have to Downgrade iPhone OS 4.0 Baseband 5.13.03 to 04.26.08 BB Using Fuzzyband. After that you can follow the below steps to unlock it with ultrasn0w.

How to Unlock iPhone 3G With 4.0 Firmware Using Ultrasn0w

  • Download the latest version of iTunes and take a backup of all your data.
  • From your jailbroken iPhone 3G, start “Cydia” and select “Manage” and then “Sources”.
  • Select the “Edit” button at the top right of the screen.
  • Now press “Add” and enter the Cydia/APT URL as “” and click on “Add Sources”.
  • After adding the sources, press “Return to Cydia” button and Cydia will now automatically update the sources.
  • Select from the list of user entered sources and search for ultrasn0w.
  • Now press “Install” and then the “Confirm” button at the top right of your iPhone screen to install ultrasn0w.
  • Ultrasn0w will automatically unlock your iPhone 3G so that you can use it with any carrier.
  • Restart your iPhone by holding down the power button for 3 seconds then moving the power slider that appears to the right. Press the power button again to turn on the phone.
  • Once rebooted, your iPhone 3G can be used with any SIM card.

So using ultrasn0w 0.9.5 you can easily unlock your iPhone 3G with iPhone OS 4.0 after it has been successfully jailbroken using Redsn0w 0.9.5.

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