The best solutions we can offer to you at this time are as follows:
1. Setup a VPN to a network with a public IP and ports
2. Purchase a static IP address from VZW for $500
3. Terminate service and switch providers to someone who offers open access to remote machines
There is nothing you can do from the Jetpack to enable this functionality if it is getting blocked by the NAT firewall, and I suspect it is because you didn't mention a VPN or a public IP. You have to expose the remote machine to the open internet to connect to it from another location.