On a system level, an iPhone can use AirPlay to cast media from video and music apps to any device that also supports AirPlay ...

Did you know you can mirror your mobile device to your Fire TV screen? It’s a quick way to share a video or song on your phone with everyone in the room. You can stream from a PC to your Fire TV ...

Also, since there will potentially be a lag between your phone and TV when casting, if you want to game ... check out how to unwind with this hidden iPhone feature and how to remove junk files ...