I have an iPhone that is activated with Independence and is running 1.1.1- never used as a phone. I never unlocked it. It also jailbroken. I want to restore it to a factory state so it can be used on AT&T like it was fresh out of the box. How do i do this? Is it as simple as upgrading to 1.1.4 like iTunes asks me to? Then is the phone back to a factory state?