How can I get Samsung smart phone work with smart TV?

Here's how to link your Samsung smartphone to your smart TV:
• Make sure your Samsung smart TV and Android device (phone, tablet, computer) are in close proximity to one another. For the best connection and performance when using features like screen mirroring, keep them no more than 10 meters (33 feet) apart. If you go further than that, you risk losing service.
Switch on the SmartThings app: To get started, launch the SmartThings app on your phone or tablet.
Hook Up Your Smartphone to the TV:
If a window prompts you to add the TV to your mobile device, tap the "ADD NOW" button.
If you don't get a pop-up window, you can connect manually through the SmartThings app's "Devices" menu.
Find your Samsung television among the available options and click on it.
You can initiate the link by tapping the screen of your TV.
After you've followed these instructions, you should be able to connect your Samsung smartphone to your Samsung smart TV and take advantage of features like screen mirroring.