I am not familiar with the 4GLTE router, but I won’t be surprised if itself is within a local network. What I mean is that the WAN IP shown on your router might not be accessible on the Internet — it’s not a public IP, but a local IP within Verizon’s network. The router’s WAN IP can be found on the router’s configuration / status page. Check if this is different from ‘whatsmyip’ result you get.