Owners of the new foldable iPhone are reporting cracks in the device’s screen, as Apple confirmed an issue with a “small number” of units.

Reports of cracks have emerged on Reddit and social media platforms since the handset went on general sale globally on Friday. Experts said there had been too few examples to determine whether there was a more serious problem with Apple’s first foldable device, which retails from $1,999 (£1,499).

Apple confirmed some devices had been affected by a display glitch.

“We are aware of an issue impacting the inner display on a small number of iPhone Duo units.…