https://www.theverge.com/2019/2/24/18238437/lg-v50-dual-screen-second-display-mwc-2019

If you haven’t already soaked up the leaks about it, the new LG V50 introduced today is a souped-up V40 with the new Snapdragon 855 processor, improved cooling, bigger battery, and the futuristic addition of 5G. The V50 is LG’s first 5G phone, in fact, and it’s also the first to be compatible with a new accessory the company is rolling out: an entire second screen.

The LG Dual Screen is essentially a folio case with a second OLED screen in it. The V50 has a 6.4-inch display, however the secondary panel here is limited to a 6.2-inch diagonal measurement, owing to its bigger bezels. I got to try out the Dual Screen system for myself here at Mobile World Congress, and there are both good and bad things to say about it.