I have an iPhone 3gs factory unlocked and jailbroken. If I upgrade to 4.1, will

it need to be unlocked again? Currently my iPhone is operating on 3.1.2 and I want to upgrade to 4.1. I understand that I can later jailbreak using tools like limera1n etc., but will I need to unlock it again or because it is factory unlocked, it will remain unlocked?
 
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