the lighting seems harsh...maybe a flash on the camera?? I know it would not be feasible to set up studio lights around a public phone but natural sunlight would be nice also!
The yellow is really vibrant and the other colors seem to be accurate. I think the composition would have been more effective if the whole handset had been shown. Seems to have a few bright spots. Maybe reducing your ev would help, if you have that ability with your camera. That data port is an interesting feature!