Hacker group The iPhone Dev Team say they will release a tool tomorrow for unlocking an iPhone running the new 3.0 firmware update from Apple.
The Dev Team's MuscleNerd has released a video demonstration of Ultrasnow, an updated version of the hacker group's Yellosnow iPhone software jailbreak released on 1 January.
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Apple has since patched the iPhone's vulnerability exploited by Yellosnow to allow iPhone users to connect to the mobile phone carrier of their choice.
Ultrasnow capitalises on another weakness in newer Apple iPhones discovered by an Israel-based hacker just six weeks after Apple gave a preview of iPhone OS 3.0.
MuscleNerd claims Ultrasnow will work on any iPhone 3G running 3.0, but not does not mention Apple's new iPhone 3GS, also due for release tomorrow.
But in a blog posting, the Dev Team said they will not be releasing any updates on their progress with iPhone 3G S.
"Nothing gives Apple the upper hand like someone tweeting or blogging partial hack results. That's not how cat & mouse is played :) That's how the cat gets fed," the posting said.