I have updated to 2.1 and have been using the device between home and work. While riding the bus, I will either do some quick browsing or listen to Pandora. Well, a few days ago, my signal type switched from 'Ev' to a 'G', rather than the expected '1x'. Now, I know about '1x' and 'Ev'; how and why did the 'G' appear? What exactly does it indicate? It doesn't show up in the user manual, nor have I seen it on a Sprint phone before this.