The engineering cost of a foldable display is largely borne by the hinge. The mechanism has to preserve screen flatness across hundreds of thousands of open-close cycles while fitting inside a chassis thin enough to fold flat, a constraint that has pushed every manufacturer into difficult trade-offs between display durability and the battery volume available in a thinner profile. Apple entered that hardware category this week. At John Ternus' first product event as chief executive, the company announced its first foldable iPhone alongside the iPhone 18 Pro, the biggest change to the iPhone release cadence in seven years.
The cadence shift is worth separating from the product news. Annual iPhone releases have organized carrier upgrade programs and component supplier ramps for years. Pairing a foldable with a Pro model in the same event means two distinct screen geometries reaching developers at once, a supply chain and targeting challenge that a single annual flagship does not create.
Ternus made his debut as Apple's chief executive at the same event.