High image quality on the small display of mobile phones is becoming highly desirable as the availability of functions for playing computer games, watching still and moving images. An experiment was carried out to accumulate colour appearance data on a 2" mobile display using the magnitude estimation method. It was divided into nine phases according to three surrounds (dark, dim and average) and three backgrounds (light-grey, black, and white). The visual data are expressed in terms of lightness, colourfulness and hue. The visual results from different phases were compared to reveal different colour appearance effects. The results were also used to test and refine the CIE colour appearance model, CIECAM02 . Two revised versions were made as a new mobile colour appearance model. There were large improvements from the new versions, especially for the colourfulness results.