Foldable phones have come a long way, but durability is still a concern. That’s why many folding phone owners turn to great cases to add a bit of extra protection to their expensive devices. The latest Samsung Galaxy Z Fold costs $1,800, the OnePlus Open costs $1,700, and the Pixel Fold costs $1,800. Clamshell foldables like the Motorola Razr or Galaxy Z Flip are cheaper, but are still pricey. Keeping these folding phones up and running for years is vital, and it’s also a challenge.