We don't officially have 4G in Denver yet, but I've found two locations that I get a good 4G signal: Near Elitch Gardens (LoDo) I-36 near Sheridan So the other day I was messing around with the 4g and accidentally turned off the "Mobile Network" option in Settings > Wireless & networks. When I was in the 4G area I didn't notice because everything worked fine. But when I left the area, I had NO DATA coverage. Of course I thought that the Sprint network was down (3G) maybe due to upgrading and eventually called Sprint to see what the deal was. Of course eventually realized that the network wasn't down so it was my phone. Was going to be driving by a Sprint store anyway, so I stopped in. Rep noticed my stupid error right away and re-enabled the "Mobile Network" and data came back to life instantly. But that got me thinking... Did I really have 4G working without the "Mobile Network" enabled? If so, that means that when I'm in a solid 4G area, I can disable "Mobile Network" and save some battery. Was I imagining this? Or can you really turn off 3G to save battery while on 4G (or Wi-Fi)? Hoping this is the case!