This new one-touch jailbreak opens your iPhone for full disk access and installs Installer.app so you can add pretty much any third party application you like. All you have to do is navigate from your iPhone to jailbreakme.com, read the directions, scroll down, and tap the button. Once you see the “slide-to-unlock” screen appear you are done. It usually takes about 30 seconds.
note: This will even activate your iPhone and bypass the whole “connect to iTunes” screen. It also knows if you are a legit AT&T customer and will not activate if you have already activated. If you still want to unlock your iPhone you can follow an easy guide here to activate, jailbreak and unlock your iPhone