Apple unveiled the iPhone Duo, its first foldable smartphone, featuring a compact palm-size design with a 5.4-inch cover screen and 7.6-inch inner display. It competes with Samsung's Galaxy Z Fold 8 Ultra, which offers a larger 6.5-inch cover screen, 8-inch inner display, and superior camera specs, though the iPhone Duo provides better durability with an IP68 rating and starts at $1,999 versus the Z Fold 8 Ultra's $2,100.