blackra1n is not a carrier unlock. You must always avoid updating your baseband to maintain your unlockability. If you use blackra1n to jailbreak 3.1 or 3.1.2, the steps you take before running blackra1n will prevent the unlock from working on your iPhone for potentially a very long time
"My father-in-law is heading back to school in the spring and wants a laptop for Christmas. The only catch is their budget is around $400 and he does not want a netbook. He's not very "tech savvy" at all and doesn't need a hoss of a machine (not that $400 could get you one). We would like to get it for him as soon as possible and would love some input."
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from Iphone dev Team
blackra1n is not a carrier unlock. You must always avoid updating your baseband to maintain your unlockability. If you use blackra1n to jailbreak 3.1 or 3.1.2, the steps you take before running blackra1n will prevent the unlock from working on your iPhone for potentially a very long time