OOOOOH! 4S. Sorry - we totally misunderstood what you were asking! In that case....
Yes. It's all over the internet. :/
If you can't spend less than 60 seconds on google to figure this out, I would leave jailbreaking alone. No offense, but it's people that are too lazy to do their homework that end up screwing up their devices and posting redundant questions about it here.
If you're willing to spend an hour or two reading up on it first, by all means, it's definitely worth it. Just don't dive in, screw up, then make a stupid thread called "OH NOEZ IZ BRICK3D MAH IPHONES - HALP!!!11!!!1!!".