I'm guessing you're still not getting it. I have an LTE iPad. I have an LTE iPhone. When I hit the road, I turn on Personal Hotspot on my iPad, then connect my iPhone to that generated network. I own several VZW LTE accounts, so I don't care about data.
On the road, I use my iPad for a huge nav system. When a call comes in, I can take it on my iPad - which is the wifi hotspot that facilitates "Continuity". Q.E.D. - and not T-Mo only, and I've been doing this since the late betas of iOS 8, almost a year now, and covered in my plan without hacks or tweaks.