Ok, you've got at least 250 posts on here and have managed to find your way to the iPhone hacks forum which leads me to ask - SERIOUSLY?
If it's a 2G then easypeasy, use pwnage tool/quickpwn to unlock it, if it's a 3G then it's trickier. Mroogle, and then follow the tutorials on iClarified. And it would help if you clarified anything at all about your situation. First things first, which country are you in? Do you already own an iPhone?