Apple Just Released ios 5.1.1 which has nothing new features but just bug fixes.There is no untethered jailbreak for ios 5.1.1 but anyone who have upgraded but with a older baseband to this firmware and reliant on the ultrasn0w unlock have a good news,Ultrasn0w Fixer has been updated to support iOS 5.1.1.
Ultrasn0w currently supports following iPhone 4 and iPhone 3GS basebands:
Step To Unlock IOS 5.1.1 with ultrasn0w fixer:
Step 2: In Cydia, browse to Manage and select Sources.
Step 3: Select Edit and Add to add the required repository. Type http://repo.iparelhos.com into the pop-up, and then press Add Source
Step 4: After the repo has been added, open it in the source list which will display theUltrasn0w Fixer 5.1.1 utility. Select the Fixer utility, and tap the Install button located in the top right hand corner. It shouldn’t take more than a few seconds to install.
Step 5: Once complete, the latest official version of Ultrasn0w, which is version 1.2.5, needs to be installed. Select Search in Cydia, type in “Ultrasn0w” and search the package.
Step 6: Once you’ve found it, install it and you are Done.
You’ve successfully unlocked your iPhone 4 and/or iPhone 3GS and feel free to use any SIM Card you want.