1.1) Windows Users: Download 1.02 apptapp at nullriver and run it to install, it will jailbreak within the process of installing installer
1.2) Windows Users: Download and run Paycay (thanks bigboss and xmods for the host), this will activate your phone. This is only needed if you plan on using your iPhone without an legit AT&T iphone plan.
2) Mac Users: Download and run Independance.
3) Once completing the Jailbreak and activation, you can proceed to unlock if you want to unlock, otherwise you are Done!