Need some guidance

First off I’d like to say when it comes to networks I novice at best.

I just bought a Pepwave Max.

I’m using an ATT and Verizon SIM for connectivity. (They do not have dedicated IP addresses)

I have a device hardwired into the Pepwave Max via LAN port.

This device has a Browers Remote Control that can be accessed when on the local network.

I want to be able to access it no matter where I’m at. For the life of me I can’t figure out how to do it.

Help please.