The Dev Team did it yet again! The cat and mouse game is on! All iPhone 3G owners (no matter what firmware you have) can now unlock their devices!

Lets get started with a step by step guide (It will be a short one this time around!)
1) Update your iPhone 3G to 3.0 . You have two options here :

redsn0w (DIY Quick!)
Pwnage Tool (Download the Custom Firmware 3.0 if you want to Jailbreak directly without messing with other tools)