I own a PPC-6700 and the N800 and here's how I get DUN to work: Install PDANet on the Phone: http://www.junefabrics.com/ You don't even need it on your pc once you have it configured properly for bluetooth activesync. The only component of the software that expires if you don't register is their desktop app. PDANet has a setting to allow DUN. Once you have it activated, the N800 will set up a successful data connection with the PPC 6700. The only thing I can say about it is that it works pretty well. As long as you don't lose your connection, you can stay connected for hours. If you disconnect or get disconnected, you will need to soft reset the PPC 6700. The workaround that they have seems to totally redirect the dataconnection of the phone. (You can shut down PDANet to get data working again without a reset, but you still need a soft reset to get another successful BT DUN connection). I think that Sprint crippled bluetooth dun on the PPC 6700. The PDANet application pretty much tricks the phone into using bluetooth activesync to establish DUN (that's my impression, anyway). Let me know if this helps!