WCF service not behaving concurrently

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WCF

I have a service code something like:

[ServiceContract]
public interface IService1
{
    [OperationContract]
    void MyOperation1();
}
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession,ConcurrencyMode=ConcurrencyMode.Multiple)]
public class service1 : IService1
{
    public service1()
    {
        Console.WriteLine("creating instance");
    }
    public void MyOperation1()
    {
        Console.WriteLine("starting..");
        Console.WriteLine(System.Threading.Thread.CurrentThread.ManagedThreadId);
        Thread.Sleep(1000);
        Console.WriteLine("Ending..");
    }
}

Client code :

static void Main(string[] args)
       {
           Thread[] t = new Thread[10];
           NetTcpBinding myBinding = new NetTcpBinding();
           EndpointAddress myEndpoint = new EndpointAddress("net.tcp://localhost:8000/MyService");
           ChannelFactory<IService1> myChannelFactory = new ChannelFactory<IService1>(myBinding, myEndpoint);
           IService1 instance = myChannelFactory.CreateChannel();
           for (int i = 0; i < 10; i++)
           {
               t[i] = new Thread(new ThreadStart(delegate()
               {
                   instance.MyOperation1();
               }));
           }
           for (int i = 0; i < 10; i++)
           {
               t[i].Start();
           }
       }

I am getting output like this(calls being processes one by one):

creating instance
starting..
3
Ending..
starting..
3
Ending..
starting..
12
Ending..
starting..
3
Ending..
starting..
12
Ending..
starting..
3
Ending..
starting..
12
Ending..
starting..
3
Ending..
starting..
12
Ending..
starting..
3
Ending..

Why are the calls not processes parallely by service?

I want the result to be something like(all threads should start parallely):

creating instance
starting..
starting..
starting..
starting..
3
Ending..
4
6
Ending..