This is HUGE! Ultrasn0w 0.93 has been released by iPhone Dev Team to unlock all iPhones baseband 05.13.04 on iOS 4 and 05.12.08 on iPhone 3.1.3 respectively. Ultrasn0w 0.93 works for all basebands since iPhone 3.0 FW and make sure to disable 3G if you are on on T-Mobile USA.

How to Unlock iPhone 3.1.3 / iOS 4 Baseband 04.26.08 to 05.12.08 with Ultrasn0w 0.93
Step 1 - Start ‘Cydia’ on your jailbroken iPhone 3GS iOS 4 springboard.
Step 2 - Select ’Manage’ tab at the bottom of your iPhone screen and then select ‘Sources’.
Step 3 - Select ‘Edit’ and then select ‘Add’. Now enter a URL source. Type ‘repo666.ultrasn0w.com ‘ and select on ’Add Source’. Once Cydia has added the source click on’Return to Cydia’ button.
Step 4 - Once the installation is completed. Search for ‘ultrasn0w 0.93′ in Cydia and install it.
Step 5 - This app will automatically unlock your jailbroken iPhone baseband 05.13.04 (on iOS 4) and 05.12.08 (on 3.1.3).
Step 6 - Reboot it. You have now successfully unlocked iPhone 3.1.3 / iOS 4 firmware running 05.13.04 and 05.12.08 baseband respectively or any baseband since iPhone 3.0 FW.
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