(adsbygoogle = window.adsbygoogle || []).push({}); I have a iPhone 3gs and I have firmware 3.13 and am looking to upgrade to firmware 4 is there a jailbreak for the 3gs with os4 I'm new to the jailbreak thing and have some cool stuff through cydia and don't want to lose it. sorry if this has been posted before does anyone know?

modmyi.com say that there is a jailbreak, but i am not 100% sure