Did Santa bring you a shiny new phone from the world’s most popular fruitmaker? You may be pleased to hear that the new untethered jailbreak for iOS 4.2.1 has been released.
While KitGuru doesn’t condone the use of jailbreaking your iPhone, we know a lot of people who do it, to get more freedom with their application selection and installation. The instructions for this modification relate to Redsn0w 0.9.7b1, a beta release of the untethered jailbreak. This release is not yet final, so if you have concerns we recommend you wait for a while longer until any bugs are found and squashed. This jailbreak is limited to the iPhone 4, iPad and iPod Touch 4G.
Just be aware that if anything goes seriously wrong (its unlikely but possible), then you will not get any support from Apple. We need to make this clear !
I tried it on my iPhone 4 and its working a treat, and the full instructions are available over at iphonefaq.