You should be able to mirror your phone to your smart TV.
Chromecast (if android) or AppleTV if iPhone. Although I think Chomecast works on both iOS and Android. Just gotta set up the smart TV as another device linked to your phone. Else, just use your phone as a WiFi hotspot for your smart TV or Roku or whatever, as the WiFi connection.
Data rates will apply though (depending on your phone plan) and streaming can eat up a lot of data. Plus keep your phone plugged in for power rather than running off it's battery.