Today on 10.30AM PST Apple released the 3.1.3 version (7E18) of the iPhoneOS. This is a warning for all those like myself that cherish their jailbroken/unlocked iPhone. DO NOT update!

Basically this update in this update fixes the consistency of launching some third-party apps, the iPhone 3GS battery level being more accurate, and repairs a bug that caused some apps to crash while using the Japanese Kana keyboard.

Honestly this doesn’t seem to be major updates to be losing your jailbreaking/unlocking needs.