I found two methods:

Methods           void RegisterAgent(object path)

                            Registers an agent which will be called whenever a

                            new Smart Messaging based SMS arrives.

Methods           void ReceiveNotification(array{byte} notification, dict info)

                            Requests the agent to process a new SMS that has

                            arrived containing a WAP PUSH.  The dictionary

                            info contains 'Sender', 'LocalSentTime' and

                            'SentTime' properties.

Can the two methods help me to handle files from WAP  push?