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I suspect that you don’t have an IP address assigned to you by Verizon that allows inbound traffic. So neither port forwarding or accessing the device remotely using OpenVPN would work. I understand that you can pay for a public IP address on Verizon…
Alternatively you could set up a Fusionhub virtual appliance in the cloud (which will have a public IP) and port forward from that over PepVPN to the Pepwave LAN.