Make sure your iPhone and TV are on the same Wi-Fi network
Turn on your TV and enable screen mirroring or AirPlay if supported
Open Control Center on your iPhone
Tap Screen Mirroring
Select your TV from the list
Enter the AirPlay code if it appears on your TV
To stop mirroring, open Control Center again and tap Stop Mirroring
If your TV does not support AirPlay, use an Apple TV or a compatible streaming device
If needed, connect your iPhone to the TV with a Lightning to HDMI adapter and HDMI cable