Apple introduced the iPhone Duo on Sept. 9, marking its first foldable iPhone. The device starts at $1,999 in the U.S. and opens to a 7.6-inch inner display. When closed, it uses a 5.4-inch outer screen for standard phone tasks.

Apple has unveiled the iPhone Duo, its first foldable iPhone, with sales set to begin October 23. The new model opens to a 7.6-inch inner screen and carries a 5.4-inch outer display. Apple says the larger panel offers the biggest