Unlock iOS 4.2.1 UltraSn0w Unlock

Unlock for Iphone 4 3GS 3G is available for download . Strange thing is , you need to upgrade your baseband to latest 06.15.00 [on iphone 3GS 3G ] in order to unlock your device . However if you are on baseband 01.59.00, 04.26.08, 05.11.07, 05.12.01, or 05.13.04 , you can proceed with the tutorial below without having to upgrade to 06.15.00 baseband. UltraSn0w 1.2 can unlock iPhone 4 on baseband 01.59.00 [only].

UltraSn0w_logoRead : How-to Upgrade to baseband 06.15.00

Important : Please Note that , there are certain risk in upgrading to baseband  06.15.00. You may void any warranty due to baseband upgrade or miss critical upgrades for your baseband as they are released by Apple. There is no way to hide your baseband . After the upgrade , you cannot restore to earlier baseband by any means.

Caution : You cannot unlock iphone 4 on baseband 02.10.01 – 03.10.01 [and later ]and cannot upgrade it to baseband 06.15.00. Upgrading Iphone 4 using any of the baseband upgrade methods mentioned here will upgrade your baseband to 03.10.01 which is not un-lockable . Wait for the release of UltraSn0w 1.3 Unlock . Subscribe to get the Unlock details when released via email .

Upgrade Baseband 06.15.00 on Iphone 3GS 3G : RedSn0w MethodPwnage Tool Method

Unlock Iphone 4 [01.59.00] 3GS 3G on iOS 4.2.1 – Complete Step-by-Step Guide :

  1. Jailbreak your iphone with RedSn0w Jailbreak Tool
  2. Launch Cydia on your device
  3. Tap Manage tab at the bottom of the screen
  4. Now Select Sources as shown in the image below iPhone 3gs Unlock
  5. Now tap on “Edit” and Select “Add”¬† . Now enter the following url ““in the box named Enter Cydia / APT URL . [image below]
  6. After the source is added , search for UltraSn0w 1.2 inside Cydia and install it on your iphone .
  7. UltraSn0w 1.2 will unlock your device to work on any carrier of your choice .Ultrasn0w unlock 1.2 Reboot your device for the changes to take place and use any sim card to make calls from your iphone .

Note that baseband 05.14.02 and 05.15.04 are still locked so you need to upgrade to current 06.15.00 baseband in order to unlock your device using the above tutorial .The unlock for Iphone 4 is being worked upon and the current unlock for iphone 4 works on baseband 01.59.00 only .

Please share this tutorial with your friends and stay tuned as we bring you the Updates for iPhone 4 Unlock . Subscribe to our mailing list or Follow us on Facebook.

Also Read : Unlock Iphone 4 4.1 01.59.00 Baseband

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