http://www.macnn.com/articles/10/08/04/requires.using.jailbreakme.first/
New ultrasn0w unlocks iPhone 4
updated 09:05 am EDT, Wed August 4, 2010
Requires using JailbreakMe first
The unofficial iPhone Dev Team has posted ultrasn0w 1.0-1, an update of its unlocking utility. The release is the first to unlock the iPhone 4, in addition to the iPhone 3G and 3GS. iPhone 4s must be on the 01.59 baseband, while the 3G and 3GS must be using 04.26.08, 05.11.07, 05.12.01 or 05.13.04.
The new ultrasn0w is being distributed through Cydia, an on-device platform for unofficial apps. To install Cydia, however, people must first jailbreak an iPhone 4 using JailbreakMe. As the website is believed to be based on a PDF exploit, Apple is likely to interrupt jailbreaking with a future iOS release, probably iOS 4.1.
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As the website is believed to be based on a PDF exploit, Apple is likely to interrupt jailbreaking with a future iOS release, probably iOS 4.1.
That's just an interruption as they fix a serious, if not critical flaw in the OS/browser.
And isn't it amazing how little press Apple gets for having such a gaping flaw in their browser on their 'secure' phone that going to a web site could allow someone to install software, hack the OS, give themselves root privileges, and basically do whatever they want. There is no user interaction at all to jailbreaking from the web site, which means anyone nefarious enough could do all sorts of things that aren't as benign as jailbreaking.