Can you use HDMI cable for 4K?

[gadget123]

As the title says do you need Apple TV or can you use an iPhone and hdmi cable do display 4k content?

 

[Chazzle]

As the title says do you need Apple TV or can you use an iPhone and hdmi cable do display 4k content?

You can use a high quality HDMI to transmit 4K content. However, I highly doubt that the lighting port on your iPhone along with the lighting to HDMI adapter can support 4K.

Edit: Found an old MacRumors thread that confirms you cannot.
https://forums.macrumors.com/threads/iphone-6s-plus-4k-output-to-tv-set.1928975/
FYI: Finding the answer took me about 10 seconds by searching online. In the future, you may want to do the same to get your answer faster instead of making a new thread. Just trying to help.

 

[Yun0]

hdmi 2.x can, but the limitation is on apple currently