For all models of iPhone running OS 3.1.3. I have tried out the tool and it is the simplest jailbreak tool ever.
The one-click jailbreak process is quick and very straightforward.
To let you have an idea about jail breaking via Spirit, here is the jailbreak guide that walks you through the whole process.
But before that U wanna know the difference between JAIL BREAKING and UNLOCKING..,
I'll explain those things later in future blog! If u know abt jail breaking here u go
As usual, before you consider jail breaking your iPhone, remember to read the requirements carefully. If you have anything unclear, just leave ur comment!!