The info isn’t 100% accurate but it might be we have an iPhone 4 5.1.1 baseband 04.12.01 unlock here! Past week brought us many signs of untethered unlock and jailbreak for iPhone 4S/4/3GS appearance that will be compatible with current iOS 5.1.1. Let me reming you that there’s still no solution for unlocking 04.12.01 and 04.11.08 basebands on iPhone 4/4S. The only chance to unlock any baseband on any iPhone is to restore your previously saved activation ticket with SAM method.
Just a day ago Dev-Team updated a bunch of extremely important jailbreaking and unlocking tools: PwnageTool 5.1.1, RedSn0w 0.9.12b1, UltraSn0w 1.2.7 and you can download these tools here. Those programs are called to support iOS 5.1.1 untethered jailbreak and unlock iOS devices. New versions of the tools bring major bug fixes, functionality improvements and features. They also got full iOS 5.1.1 compatibility.
People who use Gevey Ultra S unlock for iPhone 4S can freely upgrade to iOS 5.1.1 – the unlock still works! The recently released iOS update doesn’t seem to add problems neither for jailbreakers nor for unlockers. You still can jailreak iOS 5.1.1 with latest version of redsn0w and run that iOS semi-tethered. Now the official Applenberry Twitter has confirmed that Gevey Ultra S unlock for GSM iPhone 4S that worked on iOS 5.0.1/5.1 successfully handles his duties on iOS 5.1.1.