public static void Start()
{
//Create an instance of the GSM class.
var myPhone = new GSM("GalaxyS6", "Samsung");
//Add few calls.
myPhone.AddCall(new Call(new DateTime(2015, 3, 5, 9, 30, 10), "0883448036", 140));
myPhone.AddCall(new Call(new DateTime(2015, 3, 4, 10, 12, 53), "0883428135", 230));
myPhone.AddCall(new Call(new DateTime(2015, 3, 12, 19, 3, 32), "0883451438", 423));
//Print call information
myPhone.PrintCallHistory();
Console.WriteLine();
//Print the total price of the calls in the history for 0.37 per minute
Console.WriteLine("Total calls price: ${0:0.##}", myPhone.GetCallsTotalPrise(0.37M));
//Remove the longest call from the history and calculate the total price again
var longestCall = myPhone.CallHistory.OrderByDescending(x => x.Duration).First();
myPhone.DeleteCall(longestCall);
Console.WriteLine("Longest call removed!");
Console.WriteLine("Total calls price: ${0:0.##}", myPhone.GetCallsTotalPrise(0.37M));
Console.WriteLine();
myPhone.PrintCallHistory();
//Finally clear the call history and print it.
myPhone.ClearHistory();
Console.WriteLine("History cleared!");
myPhone.PrintCallHistory();
}