static void Main(string[] args)
        {
            Console.WriteLine("Disk Phone");
            DiskPhone dp = new DiskPhone();

            dp.Call();
            Console.WriteLine();

            Console.WriteLine("Button Phone");
            ButtonPhone bp = new ButtonPhone();

            bp.RingTone();
            Console.WriteLine();

            Console.WriteLine("Black&White Phone");
            BlackWhitePhone nokia = new BlackWhitePhone();

            nokia.Call();
            nokia.RingTone();
            Console.WriteLine();

            Console.WriteLine("Color Phone");
            ColorScreenPhone samsung = new ColorScreenPhone();

            samsung.Call();
            samsung.SurfTheNet();
            Console.WriteLine();

            Console.WriteLine("iPhone");
            iPhone EightPlus = new iPhone();

            EightPlus.Call();
            EightPlus.SurfTheNet();
            Console.WriteLine();

            Console.WriteLine("Google Glass");
            GoogleGlass coolGlasses = new GoogleGlass();

            coolGlasses.Call();
            coolGlasses.RingTone();
            coolGlasses.SurfTheNet();
        }