Calling all iPhone 3GS Owners : Please use Saurik’s Signature Server for future hacking!
Apple tightened security with iPhone 3GS and the latest 3GS hardware version is only capable of tethered jailbreak 
Saurik, the man behind Cydia implemented a clever approach to bypass Apple’s insane security features of the 3GS! He explains the whole process in great detail here.
In short, all you have to do is :
Jailbreak your iPhone 3GS. Trust me it is easy, fun and super productive to jailbreak your iPhone and it is perfectly legal!
Launch Cydia on your iPhone 3GS
Click on ‘Make my life easier, thanks!’. If you don’t see it on Cydia, your life is already made easier 
Follow these steps to downgrade your iPhone 3GS firmware in the future.
Congratulations on securing your iPhone 3GS jailbreak from all future Apple attempts to break the jailbreak!
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