I want to JB my sister's 3G and I understand I need Spirit to do it based on this: http://www.jailbreakmatrix.com/ It also says "Do not upgrade if you use an unlock on an iPhone 3G or 3GS. (You can, however, restore to 3.1.2 if you have SHSH blobs for that version.)" What does that mean exactly? Does it mean if you use Slide to Unlock? Does it mean if you use a password/PIN after slide to unlock? Does it mean if phone is unlocked? Also if she does use the passcode lock on here phone is it ok if she disables it before the JB and can she activate it again after? I just feel the words "if you use an unlock on an iPhone 3G" are a bit vague. Any clarification would be greatly appreciated. Her phone is not currently JB. Thnak you!