I jailbroke and unlocked my 3GS (4.1, baseband 06.15.00) a few months ago to use it in another country. However, my 2-year German contract is up and I could ask my former carrier to ask Apple for the official unlock. Would this work on a jailbroken/unlocked phone? I want to upgrade to IOS 5 without needed to jailbreak to unlock the phone again (I don't use jailbroken apps, really, just used it for the unlock).
Official Unlock after Jailbroken Unlock
unlock
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Best Answer
Return your phone to its standard state, so ios4.1 and then yes, you can ask the carrier to request unlock from Apple.
The unlock works by changing a database entry for your UDID on Apple servers and therefore whether or not it's jailbroken should make little difference. With that said, to be sure it's all worked ( and because you are planning to) taking it back to a standard OS install would make sense.
Hope this helps.