The world’s first commercially available folding phone was the Royole FlexPai, and I still distinctly remember using it at CES 2019, thinking to myself, “There’s no way anyone’s buying this.” And, probably nobody did. But that product lit the spark for companies like Samsung and HUAWEI to take up the challenge and lead us to where we are today with foldables.Since then, I’ve reviewed and used many Android foldables, including Samsung’s Galaxy Z Fold series, OnePlus’ brilliant OnePlus Open debut foldable, and various flip phones from Chinese manufacturers. While foldables aren’t for me personally, I’ve seen and used enough to know what separates successful ones from failures.