I've had this phone for about 5 months now. A few times, I've gotten this semi-circle tab that can be moved around the perimeter of the screen. I don't know how I enabled it, or how to get rid of it and it's annoying. The tab looks like it's shortcuts to various functions - video player, maps, scanner radio, etc. - all choices that can be edited. I want to get rid of it, but have no idea how. Help?! TIA!