I have iPhone and smart tv want to link them

• You may be able to stream from your iPhone to the TV directly, if the TV is AirPlay-enabled. List of AirPlay 2-enabled smart TVs - Apple
• You may be able to stream from your iPhone to the TV indirectly, though an Apple TV set-top box. Use AirPlay to stream video or mirror your device’s screen - Apple Support
• You may use the Apple TV app on an Apple TV set-top box (no need to stream from your phone).
• You may be able to load the Apple TV app on a supported model smart TV. Apple TV app - Devices - Apple
• You may be able to load the Apple TV app on a supported model third party streaming device. Apple TV app - Devices - Apple

All the ways to watch in the Apple TV app - Apple Support

If you want to stream contents from the Apple TV app on your iPhone then you will need a smart TV that supports airplay. See the list below. If yours isn't on the list then you will either need to get an Apple TV Box or a Roku.

LG

• LG OLED – RX, ZX, WX, GX, CX, BX series (2020)
• LG OLED – R9, Z9, W9, E9, C9, B9 series (2019)
• LG OLED – B8, C8, G8, E8 Series (2018)
• LG NanoCell – Nano 99, 97, 95, 90, 85, 80 series (2020)
• LG NanoCell – SM99, SM95, SM90, SM86, SM81 series (2019)
• LG UHD TV – UN85, UN73, UN71, UN70, UN69 series (2020)
• LG UHD TV – UM80, UM75, UM73, UM71, UM69 series (2019)
• LG SuperUHD SK 9, 8 series (2018)
• LG UHD UK 62 series or above, UK 7 series (2018)

Samsung

• Samsung FHD/HD 4, 5 Series (2018)
• Samsung QLED 4K Q6, Q7, Q8, Q9 Series (2018, 2019, 2020)
• Samsung QLED 8K Q9 Series (2019, 2020)
• Samsung The Frame Series (2018, 2019, 2020)
• Samsung Serif Series (2019, 2020)
• Samsung UHD 6, 7, 8 Series (2018, 2019, 2020)

Sony

• Sony Z8H Series (2020)
• Sony A9S Series (2020)
• Sony A8H Series (2020)
• Sony X95H Series (2020)
• Sony X90H Series (2020)
• Sony X85H Series (2020)
• Sony X80H Series (2020)
• Sony Z9G Series (2019)
• Sony A9G Series (2019)
• Sony X950G Series (2019)
• Sony X850G Series (2019 55”, 65”, 75” and 85” models)
• Sony Z9F Series (2018)
• Sony A9F Series (2018)

VIZIO

• VIZIO OLED (2020)
• VIZIO P‑Series Quantum X (2019, 2020)
• VIZIO P‑Series Quantum (2018, 2019, 2020)
• VIZIO P‑Series (2016, 2017, 2018)
• VIZIO M‑Series Quantum (2019, 2020)
• VIZIO M‑Series (2016, 2017, 2018)
• VIZIO E‑Series (2016, 2017 and 2018 UHD models)
• VIZIO V‑Series (2019, 2020)
• VIZIO D‑Series (2018, 2019)