You should be able to connect a streaming device to the hotspot on a phone. Be aware that when viewing anything it will use up a fair amount of bandwidth that can get costly if you don't have a phone account with unlimited data.
You've already got a tv with Roku built in - THAT should connect to a hotspot too.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T