The length of an iPhone varies by model. For example:

• The iPhone 13 has a length (height) of 5.78 inches (146.7 mm)

• The iPhone 11 is slightly longer at 5.94 inches (150.9 mm)

• The iPhone 13 Pro Max is longer at 6.33 inches

• The iPhone 15 models have a height around 5.78 to 5.79 inches (about 14.67 cm)

In summary, most recent standard iPhone models like the iPhone 13 and iPhone 15 are about 5.78 inches long, while larger "Pro Max" or "Plus" models can be around 6.3 to 6.7 inches in length.