The subtitles displayed on the screen of the mobile phone have the call signature (that is, color printing) introduced by the mobile communication company. (2 yuan/Month), you can set the personalized color printing content (such as mood, business and personality information) that the other party can see when calling you. Mobile color printing is a kind of value-added service, which transmits additional information during the user's call. In the process of calling and called users, the system automatically pushes preset color information (mood, jokes, business information, etc.). ) to the other party's mobile phone, so that the other party can see the color information after the call, so as to achieve the purpose of showing personality, sharing feelings, transmitting business information and so on.