There has be some articles (this, this) floating on the net that a tool named "goldra1n" can jailbreak and unlock any version of the iphone including the latest iphone 4. First of all, its a paid application. This is the first indicator that this is a scam as the tools developed by the elite iphone hacker groups (like iphone-dev team) are for free.
The goldrain tools is being marketed by a site named www.unlockiphoneus.com. When I last visited this site, it shows that it is suspended. But a new site "http://www.unlock-iphone.us/" popped up in that place. Beware of both these sites and do not get fooled. See the complaints on the site and discussions/updated articles(this, this) damning the tool.
