Retrieving SMSs from my mobile to my midlet

Please, can any one guide me how to read sms from my phone using my mobile application?
either by an example or by explaining some APIs, because I dont have any Idea about how to do this

I wand to do this in order to backup my sms in one file, because phone software is not correct and PC suit cann't recognize it
the phone I would use my midlet on is Nokia 6300 : cldc 1.1 MIDP2.0
And Thanks very much

I just want to notify that my phone seems to allow midlets to read it's contents after asking me for confirmation, because I already have application that read Contacts and so on

Java ME can't access the device SMS inbox. A MIDlet can only receive SMS sent with a port number on which it is a registered listener.

Thanks very much. That means I can use an application store new SMSs only.
but can any body guide me how to specify the messaging port number, And thanks again