public void AddCalls()
{
phone.AddCallsInHistory(new DateTime(23, 02, 13, 11, 11, 11), "0888888999", 5);
phone.AddCallsInHistory(new DateTime(23, 02, 13, 11, 11, 11), "0888888999", 124);
phone.AddCallsInHistory(new DateTime(23, 02, 13, 11, 11, 11), "0888888999", 355);
}