Sunday, jailbreak for the iPhone 4 happened. The hack liberates iPhone 4 owners from the shackles of the Apple App Store. The iPhone 4 jailbreak allows a phone to download unapproved apps from unapproved app stores. An advantage of jailbreaking destined to become immensely popular is unlocking access to other networks than AT and T. Jailbreaking the iPhone 4 "can severely degrade the experience" if you ask Apple their opinion.