If you are looking to display your phone screen on your smart tv, the most effective option is buying a $30 Apple hdmi adapter. If you want a wireless option, I think you'll need to buy an Apple TV.
Screen mirroring is only available on android and windows products, so you won't be able to use that feature on your Samsung TV with your iPhone.
If you only want to watch some apps on your TV, a Chromecast is an inexpensive option to watch YouTube, Plex, SlingPlayer, etc apps from your iPhone to your TV. You will not be able to view your Web browser on iPhone with Chromecast (only works with Windows and Android).