I SET UP bt dun with my 650 and my ipaq hx4700, it rocks! it took me 2 days to get it going but it works great now. I am getting about 80k on my 4700 when connected. With dun and wifi and edge with pdanet and my laptop I think this is the perfect combination. It is however getting more dificult to use the 650 screen after using the beautiful screen on the ipaq.