[Hasar]

Originally Posted by sucan

You are totally wrong,br, ios 4.0.2 can be jailbreak now, see the Jailbreak iOS 4.0.2 Steps by RedSn0w 0.9.5, and start now! Good news for you all?

You cannot jailbreak iOS 4.0.2 on the iPhone 3GS using redsn0w 0.9.5. It is possible only with the iPhone 3G and the Non MC model iPod Touch 2G.

Also, an unofficial PwnageTool was released the last day to jailbreak iPhone 3GS on iOS 4.0.2. After jailbreaking it, you could unlock it using Ultrasn0w 1.1-1.
Jailbreak iPhone 3GS 4.0.2
Unlock iPhone 3GS 4.0.2