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. A so-called jailbroken iPhone has had its software unlocked and modified so that it can run third-party applications not approved by Apple. Apple has been fighting jailbreaking for years.