There's more to this as well as the systems here in NA (we covered use in Mexico, USA, Canada) didn't work when putting a "server" up on a cellular connection. It's mildly technical but it has to do with how most cellular access doesn't hold it's IP address steady for long.
The design is definitely made for client use like email, web browsing or apps that go get something from the web.
A server would need to be at some IP for a time for the request to make it to the server.
This is partly why I want to hear a little more why and how they connected.