In this video I show you how to jailbreak ios 4.2.1 with greenpois0n. Greenpois0n jailbreaks the iPod Touch 2g, 3g, 4g, the iPhone 3g, 3gs, 4, iPad, and the Verizon iPhone. Greenpois0n- www.greenpois0n.com notes: – Jailbreaks All iPhones, iPod Touches, iPads, and even the Verizon iPhone 4 – No unlock…