Make sure your iPhone and Samsung TV are connected to the same Wi-Fi network
Turn on your Samsung TV
Open the content you want to cast on your iPhone
Tap the AirPlay icon if available
Select your Samsung TV from the list
Enter the AirPlay code shown on the TV if prompted
To mirror your entire iPhone screen, open Control Center
Tap Screen Mirroring
Select your Samsung TV
Enter the code if prompted
To use a third-party casting app, install one on your iPhone and follow its pairing steps
To stop casting, tap the AirPlay or Screen Mirroring icon and disconnect from the TV