Here's a quick how to, it's only for the iPhone 3G
1. Grab QuickPwn for beta 3.
2. Download this bundle ans place it into the /Data/..Bundles/ directory.
3. You're ready to go, follow the QuickPwn imstructions.
4. Thank me :-)
So, i'm not going to make an bundle for the old iPhone, as i don't have one.
Also do use this on your own risk. If you don't know what you're doing, stay away!