https://wccftech.com/google-assistant-ambient-mode-transforms-your-phone-into-a-smart-display/

Do you have an old phone lying around gathering dust? Now you just might have an actual use for it. The Google Assistant's Ambient Mode can now turn your phone into a smart display. We first saw it in action in September this year. Here's a short video of it in action.

Initially, Ambient Mode was designed for smart displays only. Now, it can be used on a wide range of smartphones and tablets. All you need is a Google Assistant-ready device running Android 8.0 Oreo or higher.