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Yes, its true as title says. iPhone Dev Team JailBroken iPhone on Its iOS 4.0. Yet, no public release but there is an ETA.

All assumtion became wrong. iPhone Dev Team has JailBreak of iPhone 4. The “userland” jailbreak vulnerability which was used by Spirit jailbreak tool was not all that properly patched by Apple, and hence iPhone Dev Team member @planetbeing and @chpwn has managed to get root access on the device using code of @comex’s userland jailbreak method. @Planetbeing posted about this news on his Twitter account.

Think I’m the first one I know about to get a root shell (and SSH) on iPhone 4, using poor @comex’s code (since he has no iPhone 4)

Musclenerd of iPhone Dev Team then followed in by posting this picture a while ago of Cydia running on high resolution screen of iPhone 4.

Congrats to @comex for another userland JB http://is.gd/d5N6I <– hi-res Cydia via @planetbeing & @chpwn iPhone4s

Though iPhone 4 now been possible to jailbreak, but dont expect Unlock any time soon. As iPhone 4 has completely different OS inside, which was never been cracked before. Read The details below

The DevTeam and others have been checking through the iPhone 4, and have noticed the baseband runs a completely different OS than on previous models. The iPhone 3G and 3G[S] both ran Nucleus OS on the PMB8878 baseband CPU (aka XGold 608), where the iPhone 2G ran the PMB8876 (aka S-Gold 2). iPhone 4 uses the PMB9800, or X-Gold 618 – running a separate OS – ThreadX, an RTOS by ExpressLogic.

Another iPhone hacker named @p0sixninja has confirmed that it cant be released in its current shape because it contains some of Apple’s proprietary code.

@i_Enthusiast the jailbreak shown is a more of a stepping stone for us, it can’t be released because it includes some of apples software

And speaking of the release date, @planetbeing has now made it more clear that it wont be out anytime soon.

Don’t want to speak for @comex, but afaik no one has breathed a word about release date and what we have right now is nowhere ready.

Another screenshot courtesy Musclenerd, this time of full root shell on iPhone 4.

Click here to see the image in iPhone 4’s full high-res (960 x 640)

Thanks:RedMondPie

You could always get support from UnlockAlliPhone.com about any Unlock & JailBreak issue of any model of iPhone including iPhone 2G,3G & 3GS and also upcoming iPhone 4. They provide Premium Members Support for life time. Means just pay one time a small fee and you will receive support(real human support – avg response time 2 hour) for all present & future version of iPhone.