Xiaomi Mi Mix 3

Xiaomi’s first ‘slider’ phone, the Mi Mix 3, starts rolling out globally.
The Mi Mix 3 sports a 6.39-inch, 2340 x 1080-pixel display, with a dual 12MP rear camera lenses and up to 8GB RAM/256GB of storage.

https://venturebeat.com/2019/01/11/xiaomis-first-slider-phone-the-mi-mix-3-starts-rolling-out-globally/