Ultrasn0w 1.2.4 is available to unlock iOS 5.the iPhone Dev-team has successfully released ultrasn0w 1.2.4 to unlock iPhone 4 and iPhone 3GS on iOS 5 with supported Basebands .
Note that:You have to jailbreak your iPhone 4 or iPhone 3GS to be able to unlock iOS 5 by ultrasn0w 1.2.4, you can jailbreak your iPhone 4, 3GS by building custom IPSW using redsn0w 0.9.9b5 for Mac from here.
From iPhone Dev-Team Blog, Please Read Carefully :
We’ve updated ultrasn0w to be compatible with iOS5, which came out a few days ago. While ultrasn0w 1.2.4 doesn’t add support for any new basebands, the update is required for any ultrasn0w unlockers trying out iOS5 (it remains backwards compatible though, so you should be able to use it no matter what firmware you have).
The supported basebands for the iPhone 3G and 3GS are 04.26.08, 05.11.07, 05.12.01, 05.13.04, and 06.15.00. The baseband supported for the iPhone4 is 01.59.00.
Remember, the only way to get to iOS5 while preserving your ultrasn0w-compatible baseband is by using a custom IPSW. redsn0w now has the ability to create such a custom IPSW for you (at least on Macs…the same capability for Windows will be coming soon).
The majority of people who use ultrasn0w at iOS5 right now will probably be those with old-bootrom iPhone3GS devices, since they already have an untethered jailbreak via redsn0w. For everyone else, the iOS5 jailbreak is currently tethered and you need to “Just boot” tethered with redsn0w every time your phone reboots. That’s not always easy to do if your phone reboots while away from home!
Important Trick for iPhone 3GS users with baseband 06.15:
Note: there’s a special “trick” that iPhone3GS owners with baseband 06.15 need for iOS5. During the new setup screens you see when you start iOS5 for the first time, you’ll be asked about Location Services. Be sure to select “Disable Location Services” when asked! Later on in the setup, you’ll have the chance to turn on Location Services again when asked if you want to use “Find my iPhone”. It’s fine to turn it back on at that point, if that’s your desire (or you can always go in and enable it in Settings.app).
iPhone 3GS with baseband 06.15 and accidentally updated to stock iOS 5 ipsw – How to fix this ?
Also, some iPhone3GS users with the 06.15 baseband may have tried to install iOS5 using a stock IPSW (even though you should never ever try to use a stock IPSW if you’re an ultrasn0w unlocker). If you did try this, your baseband is probably in an inconsistent state, and you’ll need to reflash the 06.15 baseband again (using redsn0w). Be very careful if you use redsn0w to reflash the iPad baseband — don’t interrupt the process! And please avoid using stock IPSWs in the future Unlockers should never go near stock IPSWs.
How To unlock iPhone 4, 3GS on iOS 5 with Ultrasn0w 1.2.4 :
Step 1: Open Cydia then hit on Manage then Sources.
STEP 2: Now hit on Edit on the top then Add and write down this repo: http://repo666.ultrasn0w.com
STEP 3: Now search on Cydia for Ultrans0w then hit on it then hit install.
Congratulations your iPhone 4, 3GS is now unlocked on iOS 5 by Ultrasn0w 1.2.4