I just S-Offed with Firewater. I know in the past (maybe in the revone days), I read a lot of warnings about not going back to S-On because you might never be able to gain S-Off again. Is this still the case? I think I need to have my phone serviced, and I'm worried they might not replace it--in that case, I don't want to be stuck with a devie whose firmware I can't ever upgrade.