I've got a Verizon Network Extender and it appears to be online - the tunnel is up back to VZW's security gateway, but all of my phones are refusing to register to it.

I did manage to roam onto an international network on the boarder near me in New York/Canada, so some bits of the core seem functional for authentication.

When I roam internationally I appear to be on Telus's 3G network (no LTE) for data and voice is falling even further back it looks like.