Totally dumb question, but I have several icons at the top of my screen that make sense (3G, wi-fi, alarm, battery life, etc), but there are others that I have no idea what they indicate. Specifically, I'm pretty sure the one that looks like a compass is that GPS is on (which is weird, because I didn't turn it on). There's also one that looks like shaking the phone (it's tilted and has movement lines). None of the literature I received with the phone had a guide to what these icons mean. Anyone know where I could find one?