The iPhone is limited as a camera, but also has many advantages over a camera in being discreet. It also, being slow and inflexible in exposure, able to produce some very interesting if you exploit these qualities, for example with slight (intentional or accident) movements of the camera while taking the picture. Its lens is also quite unprotected from sunlight or other sharp direct light, which has interesting effects. Admirably, though it lives naked in pockets and I give so little attention to the care of the lens, there are no signs of dirty lens, perhaps because it is pretty close to pinhole size anyway.
Here are some daylight pictures from Florence and getting to Florence. Some of the 'effects' are deliberate, some accidental.