What is the star called on a phone?

Could you clarify what you mean by "the star called on a phone"? Are you referring to a specific feature or symbol that appears on the screen of a mobile phone? If so, it could be a number of things depending on the context and type of phone. For example, it could be a star rating system used in an app, a symbol representing a favorite or bookmark, or a part of the user interface design. Could you provide more information or context to help me give a more accurate answer?