Those who enjoy the world of jailbreaking will tell you there’s no other way to use the iPhone. Of course, Apple will tell you that doing so voids the warranty so don’t whine when you can’t ship yours off if it breaks.
Apple has combated jailbreaking with firmware updates but generally hackers easily find their way around and release new tools within a week. Instead of keeping up with this method, Apple has taken a different approach. They are shipping new units with an updated boot MW3 ROM that doesn’t allow for jailbreaking to occur.
A screenshot has been taken over at iClarified that confirms the new Bootrom: