What is the focal length of the iPhone camera?

So you are wondering about the focal length of the iPhone camera or more importantly, what is the equivalent focal length relative to a 35mm film camera?

With the iPhone 4S Apple improved the lens. The new lens has a 4.28mm focal length and f/2.4 maximum aperture. This iPhone Camera should have a better advantages in low light compared to the iPhone 3G  due to the combined sensitivity of the sensor and slightly larger aperture should give the camera a one stop advantage in low light. As we noted previously, the new focal length is slightly longer than that of the iPhone 4, more akin to a 35mm than 28mm, so shots in tight spaces will be a little trickier.