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Evasi0n is the first significant jailbreak since the widely used Redsn0w iOS 5.1.1 untethered jailbreak. Hacking Apple devices is a detailed process, which is why jailbreaks are few and far between.
The evasi0n jailbreak is the first untethered jailbreak for the iPhone 5 and for devices running iOS 6.x. Evasi0n is available for OS X, Windows, and Linux on the evasi0n website.
Article Link: Evasi0n Jailbreak Installed on 1.7 Million Devices Since Monday Release
Actually, the 5.1.1 jailbreak was called Rocky Racoon.