Spirit is without a doubt the easiest way to jailbreak any Apple iPad, iPhone, or iPod touch running firmware 3.1.2, 3.1.3, or 3.2, yesterday I got a chance to get it tested on my friends iPhone 3G running iOS 3.1.3 but sadly "Spirit" was unable to recognize the device - after messing up with quite a few so called FIXED spirit downloads I was able to get it done as instructed in this post.