A co-worker inquired today about how to create a dial-up networking connection over Bluetooth with his Qtek 9100...here's the info:
The Short Version:
After you pair the devices, open the properties on the of the Pocket PC device on your desktop BT connection. Check the services for that device and select the Dial-up networking (DUN) service. After you have done this, Windows will add a new modem item, then you can create a new network connection using the BT connection.
The Long Version: (again, this assumes you have already paired your device to your desktop/laptop as well as having a data plan configured through your mobile operator)
1) Open your BT properties and select the correct device (here, I am selecting my Qtek 9100 Windows Mobile Pocket PC); click Properties.

2) On the properties dialog, select the Services tab. Check the DUN box and click apply.

3) Windows will now add a new modem

4) Once Windows has added the new modem, it will assign a COM port. At this point, you may click OK to exit the properties dialog and the BT devices dialog.

5) Now that we have added the , we need to add a new network connection to use it. Open your Network Connections and select ‘Create a new connection’. The wizard will open – click Next.

6) The wizard prompts for the Network Connection Type – Select “Connect to the Internet” and click Next.

7) Select “Set up my connection manually” and click Next.

8) Select “Connect using a dial-up modem”; click Next.

9) We now need to select the device that this connection will use; we want to pick the Standard Modem over Bluetooth that we just added. (In this case it is modem on COM35) – Click Next.

10) We now need to give the connection a name – I chose “T-Mobile (BT)”. I added the “BT” to distinguish it because I also have another connection setup for T-Mobile on USB.

11) We now need to set the phone number to dial. In this case we are setting up a GPRS/EDGE connection, so we enter *99#. Click Next.

12) As a user running as non-admin, the only option I have here is “My use only”; if I were running as admin (not recommended), I could set this connection up for all users. Click Next.

13) It now wants us to enter account information. If you need to enter credentials, do so and click Next. For T-Mobile (USA), I do not need to enter any credentials, so I just click Next.

14) The connection is now set up; added a shortcut to your desktop if you like. Click Finish.

15) Back to the Network Connections screen we see (in the red rectangle) our new T-Mobile Bluetooth connection. Double-click it and we’ll see the connect dialog as below. As I mentioned earlier, I do not need to enter any credentials, so I can just click Dial.

16) When Windows connects, you should see a notification bubble. That’s it!

To disconnect, you can simply right-click on the connection icon in your notification area and select ‘Disconnect” from the context menu.
-Nino