Hi Agedone,
To mirror from your phone to the TV, please follow these steps:
Using the SmartThings App:
1. Open the SmartThings app on your phone or tablet, and select the TV you’d like to mirror to.
2. Tap More options (three vertical dots) in the TV's page, then select Mirror screen (Smart View).
3. Tap Start now. If prompted, allow your TV to access your device.
Using Smart View (Quick Panel):
1. Swipe down from the top of your screen using two fingers to open the Quick settings panel.
2. Tap the Smart View icon.
3. Select your TV from the list, then tap Start now. If prompted, enter a PIN or allow access to connect.
Make sure your device and TV are also connected to the same Wi-Fi network.
If you need further help, please contact Samsung Support at 1-800-SAMSUNG, 8AM – 12AM EST, 7 days a week. LiveChat agents are also available through the ‘Support’ link on our website.
~ Samsung Advisor