The untether is for iOS 5.0.1 on iPhone3GS, iPhone4, iPhone4-CDMA, iPad1, iPod touch 3G, iPod touch 4G. If you have one of those devices and are not on 5.0.1 yet, update now! The SHSH window is still open for 5.0.1 If you unlock via ultrasn0w or gevey, make sure you only get to 5.0.1 via a custom IPSW! See the guides at places like iClarified.com if you don’t know how. Once you’re at 5.0.1, use the latest redsn0w 0.9.10 to both jailbreak and untether.
With all of the pandemonium surrounding the iPhone 4, the question surrounding Apple’s new masterpiece is: should I upgrade? The decision right now fueled by the excitement of innovation and hype is to do so, but if you take a step back and think, it may not be as clear as you had imagined.