How do Foldable Phones Work?

Nobody really asked for a foldable phone, but they’re on their way to being the design trend of the 2020s, and if they can come down in price and up in quality, they might actually be the new normal at some point. The hardware is clearly the main obstacle here, though, so it’s worth understanding what goes into a foldable phone and why the materials are part of what’s holding it back.