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If it's Sprint, you're pretty much without options. If it's T-Mobile, they are usually pretty good about getting you the unlock code. As for AT&T, I don't know how hard it would be. If it's Verizon, I think their models are already unlocked (Not 100% sure).
Good luck.
AT&T requires the phone to be off contract to even discuss unlocking, and then require you to submit a form from their website to get it done (can take up to 5 days from what it says on their site).
Can you still use a third party unlocking service though?
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