How do I unlock an original iPhone?

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New Member
Jul 3, 2007
I've had my iPhone since day 1 of release, it's completely untouched by any sort of software modifications other than Apple's firmware updates. I will be going out of the country for a month tomorrow and I would like to know how to unlock (more like which guide to use) my iPhone so it's sim free and still have firmware 1.1.2 if that's still possible. Thank you very much.