Leave it to the American market to screw up naming conventions again. 3G networks rebranded as 4G, VoLTE renamed to an already existing technology...
Also, "select areas in Illinois, Indiana, Minnesota and Wisconsin"? Could they be more selective? I'm wondering if they're having problems with handoff. Normally, large cities are first to get new technology rollouts. Unless they picked the major cities in those states, I would guess they picked more rural areas because they're still working on how it hands off cell towers, or because it creates extra loan on cell-towers that they're not able to launch in major markets.