Grant Paul, a San Francisco-based software hacker and open-source enthusiast, claims to have jailbroken Apples latest iPhone not 24 hours after its release, according to pictures published on his Twitter feed.
Paul appears to have installed the Cydia open-source application on the new iPhone, as evidenced by the two photos he posted to his Twitter account. Cydia is far and away the most popular app used by iPhone jailbreakers, and is essentially a portal for cracked iPhones to discover unofficial apps and customizations for installation on their devices.
Cydia in iPhone 5:
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Source: AllThingsD
Paul appears to have installed the Cydia open-source application on the new iPhone, as evidenced by the two photos he posted to his Twitter account. Cydia is far and away the most popular app used by iPhone jailbreakers, and is essentially a portal for cracked iPhones to discover unofficial apps and customizations for installation on their devices.
Cydia in iPhone 5:

Source: AllThingsD