Pianotuna, just this weekend I hooked up the couple we camp with most to Visible cell service, which I don't think you can get. They have never streamed anything before, but were interested in it since we do stream movies. They do not have any home internet, so the cell phone is all they have.
I gave them an old Google Chromecast I had laying around. Visible limits the hotspot speed to 5 Mbps, but where they live they are lucky to get 1 Mbps. They found Tubi, which gives them a good variety of free movies with commercials. I hadn't heard of it, but it looks interesting.
With that plan the hotspot on the cell phone is limited to one connection, so I set both of their phones to work with the Chromecast. With the Chromecast, If you can watch it on your phone, you can usually "cast" it to your tv. It doesn't have anything built in (it is an older one), so you use your cell phone as a remote, and also to find something to watch.
At home, we usually use a Roku to do streaming, but we do have a Chromecast, as well as having one in the 5er. We also have the Amazon Fire stick, but do not use that. I hook it up once in a while to keep it updated, but that is it.
Just a comment on Tubi, yes it is older stuff, but not everyone is wired the same. They like to watch older movies, even ones they have seen before, so they are tickled pink to have this option that they can take with them to their 5er for the rainy days.