Viewing ports of Windows Mobile SmartPhone 2003

Hello,

I have made a little application which uses OBEX and Bluetooth to send files
to phones.
It works fine for some phones (Sony P900, Siemens S55, Nokia 7650), but on
the Qtek 8080 (Windows Mobile SmartPhone 2003) I get error 10049 (Cannot
assign requested address) when I use port 0 and error 10058 (Cannot send
after socket shutdown) when I use port 1.
So I presume it has something to do with the port (on all other phones port
0 works fine).
So my question is : how can I determine which port I can use for this phone
?

Thanks for any ideas !

Michiel.