Mi Mix 4 could end up being a foldable slider smartphone as Xiaomi continues to test devices with an

A newly unearthed Xiaomi patent depicts an intriguing device with a design that would fit well with a future Mi Mix 4 (or Mi Mix 2021) thanks to a combination of foldable technology and a slider mechanism. It appears Xiaomi is pushing ahead with work on producing a foldable smartphone that will likely feature an external secondary display.