Having trouble finding this answer online. I just bought a 4K tv. Can I stream my iPhone recorded 4K video though AppleTV 3rd generation? I.e. is the 4K AppleTV just for iTunes content?
To the original question asked…
You will not get 4K quality when streaming from your phone to your 4K TV due to the 3rd gen AppleTV. Yes it will show the content of your phone, just not in 4K.
The Apple Support article explains HOW to stream via an AppleTV. For 4K quality, one must use all 4K equipment ( iPhone + 4K Apple TV + 4K television) to achieve the end result.