The biggest problem with MVNOs is that they generally only get access to lessor company's towers, and not to any roaming agreements the lessor used to augment t

The biggest problem with MVNOs is that they generally only get access to lessor company's towers, and not to any roaming agreements the lessor used to augment their coverage. The most obvious example is Sprint users have coverage in Montana despite Sprint having no towers in Montana (at least a year ago when I was carrier shopping.). But if you were on Virgin Mobile who are a Sprint MVNO, you got basically zero coverage in the state.