I have an iphone 3g 3.1.2 jailbroken and i have noticed many new applications that require 3.1.3 so is it safe to update and jailbreak again after??I just dont wanna get in a situation that wont be able to jailbreak...cause i have a new 3gs with 3.1.3 but since its not safe yet to try anything i was thinking to try on my old phone first