Hugo Rodríguez, a colour management expert, has calibrated or we'd rather say calculated a colour profile to improve the accuracy of colours displayed in the iPhone screen.
There is a profile available for download (look for the '
descargar el perfil' reference) so that the user can convert the images into that profile before uploading them into the iPhone, in order to properly display their colours when visualized in the Apple machine.
Unfortunately the article is in Spanish but with some easy to follow images and references:
iPhone colour calibrationBR