These symptoms have started in the last couple of days: I try to make a call and it just sits at dialing, then notice I have no bars (when I normally have at least 2). I go into Settings->Networks and see that "Mobile Network" is greyed out and says "Turning on". I wait, and nothing happens. Turning on Airplane mode and then turning it off seems to give it a kick and make it connect. I can make and receive calls for a while, but then it goes back to 0 bars/no connection. Also turning wifi on seems to also give it the kick it needs to connect. No recent app updates I'm aware of. Before this started happening I was in a rural area for a few days and had it on either Roaming or Airplane for a few days. After I got back I switched the Roaming mode back to "Sprint Only", which is what I've always had it set to. Don't know if that's connected to the problem, but it did start happening after I got back to civilization. Any ideas?