CNET Editors' note: Jailbreaking and/or unlocking your Apple idevices will void your warranty. It is a complex process and is recommended for experienced, technologically savvy users. If you unlock or jailbreak your iOS device, you're doing so at your own risk. CBS Interactive does not accept any responsibility for any problem that may arise.
From Green Pois0n:
Greenpois0n is an untethered jailbreak tool to jailbreak iPhone 3GS, iPhone 4 GSM, iPhone 4 CDMA, iPod touch 2G, iPod touch 3G, iPod touch 4G, iPad, iPad 2 and iPhone 4S.
Release Candidate (RC6.1) will jailbreak devices running iOS 4.2.1-4.2.6.
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