iPhone Duo vs iPhone 18 Pro

117.8 mm150.0 mm84.1 mm71.9 mm

iPhone Duo: 117.8 × 84.1 × 11.3 mm · 254 g
iPhone 18 Pro: 150 × 71.9 × 8.75 mm · 211 g

Source: Apple technical specifications for iPhone Duo and iPhone 18 Pro. Body dimensions exclude the camera bump; foldable phones are shown folded.