BlackBerry Forums Support Community - how can i differ incoming sms from mms?

hi,
i've implemented MessageListener and i'm wondering why incoming sms is recognized as an mms.. here is my code:

Code:

public class MessageIncoming implements MessageListener{





public void incomingMessage(){



        try{

                _messageConnection = (MessageConnection)

                Connector.open("sms://:0", Connector.READ);

                        

            _messageConnection.setMessageListener(this);



                }catch(Exception e){}

                

        }//end of incomingMessage() method





public void notifyIncomingMessage(MessageConnection _mc){



        try{

                

         _messageConnection.receive();

                

                        

        if( _messageConnection instanceof TextMessage ){

        

      Dialog.alert("sms");

                                

        }        else{

                     Dialog.alert("mms");        

                                

                        }

                        

                }catch(Exception e){}

                

        }//end of notifyIncomingMessage() method

}

it looks like sms is not always instance of TextMessage..

Does any of You have any idea how can i differ incoming sms from mms?

kind regards