Apple’s first foldable iPhone starts shipping October 23 without Face ID, and the second one may bring it back. Bloomberg’s Mark Gurman said on his Power On podcast that Apple is already testing prototypes. They reportedly have a Face ID sensor hidden under the screen.

Why does this matter? The original iPhone Duo costs $1,999. It unlocks with a fingerprint sensor in the side button, not the face scanning found on Apple’s other flagship phones. iPhones have used Face ID since the iPhone X, nearly a decade ago, so anyone who pre-ordered a Duo may wonder whether Apple will fix that. The report suggests the company is at least working on it.

Under-display means the hardware hides behind the screen instead of sitting in a visible cutout. The sensor would sit under the outer display, so the phone wouldn’t need a notch. That idea is easier to believe because the original Duo already uses Apple’s first under-display camera.

Why Face ID isn’t a sure thing

Nothing is final.…