all four one!
Around an hour ago the new version of the iPhone Operating System (now called iOS) was released.
iOS 4 is a huge release for Apple with many many changes and those changes offer slick additional features.
These new features are being offered by Apple as a free upgrade to qualifying devices.
We are working hard on a release to our tools that will jailbreak your device (or give you iOS 4 via the jailbreak train) and provide you with a carrier unlock.
Until these tools are released you should hold off on updating your device until we have
fully tested our tools with all the relevant devices.
If you rely on hacktivation or a carrier unlock (ultrasn0w) then you should not upgrade until we have fully tested and released our tools.
Dont be tempted with unofficial PwnageTool/redsn0w bundles or releases, just check here or our
team twitter for real time release information.
Remember, we risk our devices so
you dont have to (but this time anyone who has made a mistake upgrading their baseband firmware
should be OK
real soon 
Now!
Update #1: redsn0w beta has been updated to hacktivate iOS 4.0 for iPhone3G (in addition to jailbreaking the iPhone3G and iPod Touch 2G). The download links for redsn0w 0.9.5b5-3 are:
For now, the redsn0w beta release supports only the iPhone3G and iPod Touch 2G at todays 4.0. Its still a beta, so youll need to let Cydia reorganize, reload, and update after using redsn0w.