public static void Main()
{
GSMTest.Init();
GSMTest.Check_Correct_ToString();
GSMTest.Check_Correct_IPhone4S_Info();
GSMCallHistoryTest.Init();
GSMCallHistoryTest.Display_Calls_Info();
GSMCallHistoryTest.Check_Correct_Calculate_Calls();
GSMCallHistoryTest.Check_Remove_Longest_And_Calculate_Calls();
GSMCallHistoryTest.Check_Clear_Call_History();
}