Unfortunately, it's an AT&T 3Gs iPhone, and since I live in Costa Rica, I have to jailbreak/unlock it in order to use it. (even thought I'd love to have it unlocked) to not have to jb/unlock it. Currently it's running 4.0.1, I was hoping to learn what is the latest untethered jailbreak in order to update it and not have any issues. Also what are the precautions I should have with having it jailbreaked/unlocked. I want to keep it as retail as possible but try to have the latest versions possible. Thanks!