static void Main(string[] args)
{
Console.WriteLine("{0,10}TASK FROM 1-4",string.Empty);
Console.WriteLine();
GSM newGSMOne = new GSM("Lumia 900", "Nokia", 900, "Vasil");//instance with full contrsuctor arguments
newGSMOne.PrintGSMInfo();
newGSMOne.BaterryInfo.PrintBaterryInfo();
newGSMOne.DisplayInfo.PrintDisplayInfo();
Console.WriteLine();
Console.WriteLine("{0,10}TASK FROM 5-7", string.Empty);
GSMTest.TestGSM();
Console.WriteLine();
Console.WriteLine("{0,10}TASK FROM 8-12", string.Empty);
GSMCallHistoryTest.AddCallTest();
GSMCallHistoryTest.PrintCallHistoty();
GSMCallHistoryTest.PrintBill();
Console.WriteLine();
GSM.RemoveCall();
Console.Write("Total Amout after we delete longest call is {0}.");
GSMCallHistoryTest.PrintBill();
GSM.RemoveAllCalls();
Console.WriteLine("History after removing all Calls.");
GSMCallHistoryTest.PrintCallHistoty();
}