A telephone hands-free system for a mobile telephone, having a holder (1) which has electronics, for holding a mobile telephone which is designed for wire-free communication, and having a control arrangement for controlling at least one hands-free function for the mobile telephone can be designed with a universal holder (1) for different mobile telephones in that the control arrangement is accommodated in the holder, in that the holder is designed for wire-free communication with the mobile telephone, and in that the holder can be adjusted for mechanically holding mobile telephones of different size.