Hello everyone, in the past my Iphone 3GS was JB on the 3.1.2, but in some point I got stuck on the boot loop and I just gave up hope and restored to 3.1.3. Now that the IOs 4.0 was released, I started researching again and I found out about the spirit JB. I really want to JB again, and I would also like to unlock it, so I can interchange my sim cards. My question is, is it safe to JB my 3.1.3 with spirit and unlock it using UltraSn0w - how can it affect the 4.0 jb in the future? I was reading about the Pwnage tool for the IOs 4.0 and it doesn't support previously JB phones by spirit. My Specs: Iphone 3GS 3.1.3 new bootroom with only 3.1.3 SHSH on server. Should I jb it now or continue to wait?