Xiaomi basically invented the idea of the bezel-free phone in the original Mi Mix. Having evolved the screen-to-body ratio to epic proportions in its follow-up Mi Mix 2 the inevitable happened: every other company copied many of its ideas.

So where does a company go from there? Into the past to bring us the future, but of course! For the Xiaomi Mi Mix 3 is the slider phone reimagined; embodying modern style and minimal bezel with a retro-like slide-to-open feature to reveal its otherwise hidden front-facing cameras.
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https://www.pocket-lint.com/phones/reviews/xiaomi/146129-xiaomi-mi-mix-3-review