So I just got a Droid x2, and have been having some battery life/heat issues with it. I suspect something, either a rogue app or a hardware problem, might be using 3G in the background, because even when I use the phone the 3G indicator hardly ever blinks. Problem is, I can't tell what "on" and "off" are on the 3G icon. I'm seeing almost constant black arrows, which occasionally change to gray. Does that mean its transmitting constantly or hardly at all? I get reasonable speeds while surfing over 3G. Bottom line question, what do black and gray represent in the 3G icon in the status bar? Thanks!