I've noticed that my 3g icon changes colors. Someone with more knowledge please explain. Sometimes its greyed out. Sometimes the 3g is white but the arrows are greyed out. Those I can guess. What really bothers me is when the 3g is white and then the 3g changes to green. When it changes to green so does my signal bars. Then when I switch to wifi the signal bars go white and after a few seconds the signal bars go green and the wifi icon goes green with it. What's all them mean? Is there an icon glossary somewhere?