Thanks Zammy-Sam - I am using 10.4.x, I tried to use the build in bluetooth adapter, I use the bluetooth setup assistant - follow all the instructions. I tried only to add the phone as "internet..." and do not klick on the other sync options. I also tried to klick on everything.
I have a similar problem with my P900 - there I get an internet connection, however no data is received.
I had this problem already with my PC (I recently switched to Apple, and I do not regret is one bit - long life MAC). I got a connection with the IR port, worked fine, but not with the bluetooth option.
As I bought the mobile phone in China (the K750c Version) I suspect that maybe the problem it with Sony Ericsson.
Thanks
Yogi