[mrsmith]

Any “smartphones” have HDMI port for video?

[ctdonath2]

iPhone Lightning/HDMI adapter: https://store.apple.com/xc/product/MD826AM/A

For 2-3x that, get an Apple TV and wirelessly connect.

Phones are too small to warrant implanting a permanent HDMI port.

[SunkenCiv]

There are also USB-C and probably still micro-USB (both common on android devices) adapters to HDMI, make sure the phone will work with them first. :^)