Here is the user agent:
SAMSUNG-SGH-I607/I607FG1 Mozilla/4.0 (compatible; MSIE 4.01; Windows CE; Smartphone; 320x240) UP.Lin
The weird thing is that I went to the forum home and it suddenly showed the mobile style. So I clicked on a specific forum and then it went back to the "normal" default style. I drilled into some messages and still it was the default style, not the mobile style (although I did stay logged in).
Not sure what to make of it, do you mind browsing my site to see what sort of effect it has on your client? I went to your site Dartho on my BlackJack and the mobile skin came right up. It almost seems as if something isn't installed correctly, but I did follow the directions.