How to legally jailbreak an iPhone 4 version 6.1.3 for free, and no scams?

I really want to jailbrake my iPhone 4 for free and legally without all the scams. Someone help me please.

Jailbreaking is illegal. You can't do it legally

Don't jailbreak it, when I did it messed up the whole phone.made it slow, crashy, and everything.plus now with installuous (however you spell it) gone, jailbreaking for free apps is pointless.

Jailbreaking IS 100% legal. Unlocking isn't (unless your carrier does it). 6.1.3 is not easily jailbreakable from the folks at Evis0n yet, but a patch is coming.