This app is just like Google Maps but instead of traffic shows you 4G on a very detailed scale. It's based off reports from other people running the app and helped me find a location 4 blocks away that had reported 4G. I walked over and got 2Mbps down on the SpeedTest.net app. I live in NYC and 4G is not official here yet so this was a great surprise. Look for "4G MapViewer" on the Market and grab it! You might find a location nearby and it will help everyone else!