Apple has begun shipping new units of the iPhone 3GS that reportedly cannot be jailbroken using common methods. These new units have a new boot ROM that apparently can't be touched by the exploit, 24kpwn, from the iPhone Dev Team. The news comes just days after jailbreaking icon George Hotz released his blackra1n jailbreak.

Apple Tweaks iPhone 3GS to Lock Out Jailbreakers