public static void CallHistorySimulation()
{
GSM htcMini = new GSM("One mini", "HTC", 400, "Ivan", new Battery(BatteryType.LiPol, null, 400, 60), new Display(4.3, "16M"));
htcMini.AddCall(DateTime.Today, DateTime.Today.AddMinutes(10), "1234567890");
htcMini.AddCall(DateTime.Today, DateTime.Today.AddMinutes(20), "1234567890");
htcMini.AddCall(DateTime.Today, DateTime.Today.AddSeconds(10), "1234567890");
htcMini.AddCall(DateTime.Today, DateTime.Today.AddSeconds(0), "1234567890");
htcMini.AddCall(DateTime.Today, DateTime.Today.AddSeconds(48), "1234567890");
Console.WriteLine("Call history\n");
Console.WriteLine(htcMini);
Console.WriteLine("Total price: {0:F2}\n", htcMini.TotalAmountOfCalls(0.37));
htcMini.DeleteLongestCall();
Console.WriteLine("After remove longest call\n");
Console.WriteLine(htcMini);
Console.WriteLine("Total price: {0:F2}\n", htcMini.TotalAmountOfCalls(0.37));
Console.WriteLine("After clear call history\n");
htcMini.DeleteAllCalls();
Console.WriteLine(htcMini);
}