[kotaKat]

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.

[wildzzz]

I could see Verizon access points but just couldn't connect to any of them. I had no issue sending texts over wifi though.

[Nextgrid]

Parts of the HLR might be unavailable or under a thundering herd as all phones are trying to register at once. The HLR would also be involved if using EAP-SIM/EAP-AKA so that would explain failures on the Wi-Fi access points.

[threecheese]

Same. Femtocell is online but no clients, phones on SOS mode.