Just look at Huawei's trifold phone
Briefly

Huawei's Mate XT is the world's first trifold smartphone, presenting a mix of innovative design and functionality. Priced under $4,000, it features three display configurations: a 6.4-inch phone mode, a square shape at 7.9 inches, and a 10.2-inch tablet mode. Though initially challenging to open due to its unique folding mechanism, the satisfaction of mastering it outweighs any awkwardness. Despite being thicker and heavier than standard smartphones, it's still relatively manageable, and the sturdiness combined with the tapered design adds to its comfort. However, the exposed screen edges raise concerns about scratches and fingerprints.
The Mate XT feels sturdy and comfortable, though thicker and heavier than a typical phone; it's about perspective when comparing it to other devices.
Learning to open the Mate XT requires adjustment, as its unique folding segments present a challenge that's rewarding once mastered, creating a satisfying user experience.
Read at The Verge
[
|
]