static void Main(string[] args)
{
MobileOperator mobileOperator = new MobileOperator();
MobileAccount mobileAccount1 = new MobileAccount(123);
MobileAccount mobileAccount2 = new MobileAccount(456);
mobileOperator.AddNumber(mobileAccount1);
mobileOperator.AddNumber(mobileAccount2);
mobileAccount1.MakeCall(456);
mobileAccount2.SendMessage(456, "Hello");
}
public void AddNumber(MobileAccount mobileAccount)
{
mobileAccounts.Add(mobileAccount);
mobileAccount.CallEvent += MobileAccount_CallEvent;
mobileAccount.MessageEvent += MobileAccount_MessageEvent;
}