The dev team has already been able to jailbreak iOS 4.3.1 though a tethered jailbreak, however an unlock for iOS 4.3.1 has yet to be released. If you are someone who is waiting to update to iOS 4.3.1 to fix bugs but can’t do so because you have an unlocked iPhone, here is some good news.
The dev team honcho; MuscleNerd, has confirmed that a unlock for iOS 4.3.1 for iPhone will be out shortly with an updated version of Ultrasn0w. He confirmed this through a series of tweets, which read like this:
BTW ultrasn0w needs an update for 4.3.1, so unlockers should wait until that gets pushed out (hopefully also today)
The upcoming ultrasn0w update is *only* for 4.3.1 compatibility. Please don’t read anything else into it!
The ultrasn0w update won’t be a new unlock, but 4.3.1 FW itself breaks current ultrasn0w (unintentionally)
So the Ultrasn0w update will not be a new update but is a patch to fix an impending problem with iOS 4.3.1 that breaks the unlock and is only being updated for iOS 4.3.1. MuscleNerd also said that the iOS 4.3.1 update for Ultrasn0w should be released today.
So good news for you people who have been putting up with iOS 4.3 because of the unlocking problems. Hopefully it should be out anytime now.