The original iPhone (1st generation) measures approximately 115 mm (4.53 inches) in height, 61 mm (2.40 inches) in width, and 11.6 mm (0.46 inches) in thickness

. Another source lists the depth slightly differently as 7.6 mm (0.3 inches), but the height is consistently about 115 mm (4.53 inches)

. So, the length (height) of the iPhone 1 is about 115 mm or 4.53 inches.