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Older phones require the Dex Dock or Pad (which adds HDMI and other ports). With the Note9, you can plug a USB-C to HDMI cable right into it.

• esotericn 8y ago
  Hm. I can already plug a USB-C to HDMI cable into my Note8. Does it work if you do that + use Bluetooth peripherals?
• voltagex_ 8y ago
  There was/is a "C-Force" branded hub that was smaller and (slightly) cheaper than the DeX dock that put the S8/+ into DeX mode just fine.