Untethered jailbreak released for iOS 4.2.1
You will be able to reboot your device without having to jailbreak again after using greenp0ison, according to Engadget. However, it only works on the Macs (connected to an iDevice) so far and you won’t be able to swap sim cards if you are on 4.2.1.
According to CNET, 4.2.1 has actually had a jailbreak for a while but not an untethered one with rebooting like Greenpois0n allows.
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