The iPhone Duo starts at $1,999 for 256GB, with a 2TB model costing $3,199, in star white and night sky colors; preorders start Oct. 16, and sales begin Oct. 23 (Dominic Preston/The Verge)

Apple unveiled its first foldable iPhone, the iPhone Duo, featuring a 5.4-inch outer screen, a 7.6-inch inner screen, the A20 Pro chip with a new display engine, and Touch ID. The device launches in Star White and Night Sky with 256 GB starting at $1,999 and a 2 TB model at $3,199, with pre-orders beginning October 16 and sales on October 23.