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I think it doesn't work all that good on the 4G advanced, but the advanced 2 and advanced 3 should be capable of DMZ and port forwarding.
Results may vary though as i think that if the Hotspot changes cell towers it can muck about with any port forwarding rules
The only way around this that I have found is to tether your hotspot to a laptop / pc then run a ethernet cable from your laptop to your console.
While this might not work for anyone without a laptop and cable ( obviously ) it is that only thing I have managed to find that actually allows you to run an open nat type on a console using a wifi hotspot.
Don't think that's going to work, as they are giving us non public IP address.
Even if we're connecting via a laptop, it's still non public IP, correct me if I'm wrong though