Jailbreak iPhone 3GS
iPhone 3GS owners should be happy now that they can easily jailbreak the 3GS with the new PwnageTool, but…
The iPhone 3GS is now supported in PwnageTool 3.1.3, assuming the phone was pwned at 3.0 or 3.0.1 – PwnageTool does not support the 3GS out of the box. If your iPhone 3GS has 3.1 preinstalled and is not Pwned then there is no tested jailbreak solution at the moment.
In other words, if you just bought your iPhone 3GS and it came with 3.1 then this won’t work to jailbreak your phone.