Soon after the release of iOS 4.1 a vulnerability was found - this vulnerability is currently being worked on and hopefully a jailbreak will be developed soon.
No mention of a corresponding unlock has ever been mentioned and, based on comments by a prominent hacker, there is a possibility that you will first need to be on a firmware version lower than 4.1 before upgrading to 4.1 ( probably via Pwnage Tool ) in order to preserve the unlock that exists in the lower version firmware. This way you can be on 4.1 with an unlocked iPhone.
It all probably sounds confusing but the bottom line is DO NOT upgrade to 4.1, even if you are on 4.0.2 firmware where there this is not a jailbreak for the 3GS iPhones.
Furthermore, if you "accidentally" ( or deliberately ) upgrade your firmware to a higher version ( e.g. 4.1 ) that does not have an unlock, downgrading to a lower version ( which, by the way, cannot be done for out of the box 3GS and iPhone 4 models ) WILL NOT make your iPhone unlockable. This is because even though you may have downgraded to a firmware version that can be jailbroken, the component of the firmware that is unlocked DOES NOT get downgraded - it stays at the higher version and is not unlockable. This is why you do not want to go to 4.1 if you rely on an unlock.
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