We've been told by Verizon that LTE Internet (Installed)/HomeFusion is no longer being offered, and SmartHub is the replacement product. With HomeFusion I've been able to get DMZ to work, as well as port forwarding predefined applications, but not custom port forwarding (which I suspect is a bug in HomeFusion firmware). This would seem to indicate the HomeFusion router receives a public IP address.
In my testing of a Jetpack, DMZ and port forwarding do NOT work, probably because of double NAT. I'm wondering if SmartHub follows the Jetpack/MiFi way of doing things (no public IP), or the HomeFusion way (gets a public IP). This doesn't appear to be documented anywhere.