Router not connected to the Internet

I don't know if his will help your setup, but my wife has an iPad (which is also a cell phone) which she uses to download videos from Netflix over the internet, and she has an adapter that our daughter gave her that connects to the iPad on one end and to an HDMI cable on the other. She uses that to connect the iPad to the TV and plays the movies that she has downloaded onto the iPad.

It seems very simple to use (not that I have done any of it).

I think the key is the phone plug to HDMI connector.