I have five LTE dongles, What I want is to connect them to my pi 3b+ with a usb hub and use them as a proxy.
Do not both the LTE dongle and my home wifi have NAT so we need to do this by reverse port forwarding via some VPS.
so I should be able to access my dongles internet remotely by VPS-IP:port1000 for dongle 1
VPS-IP:port1001 for dongle 2
VPS-IP:port1004 for dongle 5
meaning when I connect to this proxy, my outgoing IP should be of dongle's IP
The setup can be done with Squid = http://www.squid-cache.org/