[kermitology]

Yeah blackra1n is pretty much the simplest thing to do.

If you want to unlock the phone, then you need to use pwnage tool, and that's slightly complicated.

ANY method to jailbreak the phone leaves you vulnerable to the rick-roll and the malicious worm. But all you have to do is change the default ssh password from Alpine to something else. You can do that by downloading a terminal app from Cydia.