To screen mirror an iPhone to a smart TV, the most common and easiest way is by using AirPlay if the TV supports it. Here is the general process:

• Make sure both the iPhone and the smart TV are connected to the same Wi-Fi network.
• On the iPhone, swipe down from the top-right corner to open the Control Center.
• Tap on "Screen Mirroring" (an icon with two overlapping rectangles).
• Select your smart TV from the list of available devices.
• If prompted, enter the code shown on the TV screen on your iPhone.
• Your iPhone screen will be mirrored to the TV.

If the TV does not support AirPlay, you can also use third-party apps like AirBeamTV or DoCast to mirror your iPhone screen wirelessly. Alternatively, a wired connection using a Lightning-to-HDMI adapter and HDMI cable can mirror the display reliably. Specific to Samsung TVs, you might need to enable AirPlay in the TV's settings under "Connection" -> "Apple AirPlay Settings" before mirroring. In summary, wireless mirroring mainly uses AirPlay built into iPhones and many smart TVs, while apps or adapters offer alternatives for unsupported TVs.