Unlock iPhone 4/3GS On iOS 5 With Ultrasn0w 1.2.4 [Guide]
he iPhone Dev Team has released Ultrasn0w 1.2.4 to Unlock iPhone 4 and iPhone 3GS unlock on iOS 5. If you are relying on unlock on your device on iOS 4.x.x now you can update to iOS 5 and remain unlocked but remember Ultrasn0w 1.2.4 does not support any new basebands.

Ultrasn0w 1.2.4 Supported Basebands
01.59.00
04.26.08
05.11.07
05.12.01
05.13.04
06.15.00
If you have an iPhone 4 on baseband 1.59.00 you will have to build your own custom version of iOS 5 using the latest Redsn0w 0.9.9b5.
How To Unlock iPhone 4/3GS using Ultrasn0w 1.2.4
1- Jailbreak your device using Redsn0w 0.9.9b5
2- After jailbreaking your device open Cydia > Manage > Sources.

3- Hit Edit > Add and type this repo: http://repo666.ultrasn0w.com

4- After adding the repo, Search for Ultrasn0w and install it.

After a respring and a tethered boot, you are good to go.
______________________________________________
iPhone Dev Team Note About iPhone 3GS on the iPad baseband 06.15.00:
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).
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.
What if you are on a higher baseband?
If Ultrasn0w 1.2.4 does not support your baseband, The solution now is the Gevey SIM.
he iPhone Dev Team has released Ultrasn0w 1.2.4 to Unlock iPhone 4 and iPhone 3GS unlock on iOS 5. If you are relying on unlock on your device on iOS 4.x.x now you can update to iOS 5 and remain unlocked but remember Ultrasn0w 1.2.4 does not support any new basebands.

Ultrasn0w 1.2.4 Supported Basebands
01.59.00
04.26.08
05.11.07
05.12.01
05.13.04
06.15.00
If you have an iPhone 4 on baseband 1.59.00 you will have to build your own custom version of iOS 5 using the latest Redsn0w 0.9.9b5.
How To Unlock iPhone 4/3GS using Ultrasn0w 1.2.4
1- Jailbreak your device using Redsn0w 0.9.9b5
2- After jailbreaking your device open Cydia > Manage > Sources.

3- Hit Edit > Add and type this repo: http://repo666.ultrasn0w.com

4- After adding the repo, Search for Ultrasn0w and install it.

After a respring and a tethered boot, you are good to go.
______________________________________________
iPhone Dev Team Note About iPhone 3GS on the iPad baseband 06.15.00:
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).
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

What if you are on a higher baseband?
If Ultrasn0w 1.2.4 does not support your baseband, The solution now is the Gevey SIM.
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