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I've seen a particular phone on Engadget and many other sites but I can't figure out what it actually is.
Here is a link: https://www.engadget.com/2016/05/22/google-science-journal-for-android/
If you're talking about the one in the title picture, it's obviously an LG V10, specifically the dark blue color variant. The signature "secondary screen" is present.
Required, but never shown