I think you're right, I have the Virgin and I'm in metro detroit, which shows zero service anywhere on the sprint map within 30 miles of my location. So I don't get why it's trying to pick up a signal. I can say occasionally it worked with 4g on. I have since disabled it in the system settings>wireless & networks> mobile networks>4g settings>network mode //changed to CDMA., and haven't seen any lagging connection problems since.