You can buy PDAnet, great application $34 for one license for the phone. You can install the PDAnet application on as many computers as you want, the license is just for the phone itself. I'm using it right now as I type. Excellent product. Plus if you get another phone, you get a $5 discount as a returning member! http://www.junefabrics.com I think is the site. You might want to check that out. Either that or you can download PHM RegEdit and look around the forums on how to disable Multi-NAI for the Modem Link app (Though I can't seem to get mine to work on both WM5 and WM6...)