iPhone Air vs iPhone Duo

156.2 mm117.8 mm74.7 mm84.1 mm

iPhone Air: 156.2 × 74.7 × 5.64 mm · 165 g
iPhone Duo: 117.8 × 84.1 × 11.3 mm · 254 g

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