Greenpois0n released for Mac and Windows user, this version supports firmware 4.2.1 You can upgrade your iphone to latest firmware version and Jailbreak easy now. How to guides and download links available at unlockanyiphone.

However this will not carrier unlock your iphone it will jailbreak it only. If you care about the carrier unlock DON’T upgrade yet. Ultrasn0w has yet to be upgraded.
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To all iphone users/members: do NOT upgrade your iphone through latest 10.1 iTunes yet if you care about the carrier unlock! Instead use our NEW guide to upgrade any iphone to most recent 4.2.1 version.
And once again I want to send a BIG thank you to our development team who again came QUICK with a solution to our problem.
THANKS guys!!!
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All customers and members should stay away from upgrading to BETA 3.1.3 version which was released by apple yesterday at 10.30AM PST February 2nd 2010. Like always the giant tries to fix some ‘holes’ used for the unlock proccess.
Warning to all members: We are not going to unlock any beta version since changes could be applied very quick. As soon as the final version comes out to the public we will release our new unlock solution.
Please be aware of this: don’t upgrade your iphone to any BETA version.
Enjoy your unlocked iPhone and keep watching www.unlockediphone.info for new upgrades.
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