Same with the S8-S9. Just need a USB-C Hub. I just tested it on my s9 plus and was able to get DEX to fire up on my monitor. Never used it before, but was impressed with it.
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I am taking my S9+ work phone if my Note 9 doesn't come in by my trip on the 25th, and will use the DEX to do my personal reading/browsing of the web. I'm taking a microsoft wireless keyboard/mouse combo with me, and the USB-C hub with hdmi cable and will hook it up to the TV in my Hotel room and use that while I am there. I have a work laptop, but it is not for personal use. Instead of hauling two laptops, this will come in handy and makes my life better.