Apple’s first foldable is now in customers’ hands, and the early software experience is built around the large inner screen. The Duo opens into a 7.6-inch display that lets two apps sit side by side without feeling cramped, something the company spent years refining in iOS. Sales started October 23 after a limited pre-order window, and early store traffic suggests strong demand even at the $1,999 starting price. How long supply stays tight will decide whether this becomes a mainstream product or stays a premium showcase.