I have the same problem. I hope to get some solution. I would like to use my 6210 as wireless (HSCSD) modem. There is working Infrared communication between the phone and laptop, so it should not be so difficult.
RE: software compatabe with 6210&windows xp?
Take a look at this site.
Use the windows 2000 drivers. The only message you will get is that the drivers are not digitally signed for WinXP. Other than this it should work. Check the settings on your Com port if you are using a cabel. Device manager/ Ports / Com / Properties/ portsettings / Bits pr. second.
This should be set to 115200 before you install any sw.
If you have installed the PC Suite please note that the Connection Manager might cause problems with modem detection. A workaround would be either to end the process NclConf.exe or open the connection manager and set the connection type to IR if you are using cable and Vice Versa.