First make sure you've installed the Nokia PC Suite software from the Nokia CD. After rebooting your computer, you should see a new icon in your System Tray, like the last one in this image: . You also have to be sure that your mobile phone has Bluetooth turned on.
Now we need to know exactly what COM port will be used to communicate with the mobile phone. Right-click the Bluetooth icon in your System Tray, and select Advanced Configuration. Select the Local Services tab, and you'll see a dialog like the one on the right. Take note of the value in the Bluetooth Serial Port service. In this case it's COM3. You can close this dialog without changing any setting.
Right-click the mRouter icon in the System Tray and select Properties. Make sure you check the COM port corresponding to the one found in the previous step. Close this dialog.
To start communications between devices, open your Bluetooth Places icon from the desktop. Double-click the Entire Bluetooth icon to see the next dialog.
Double-click the icon corresponding to your nokia 3650:
And double-click Bluetooth Serial Port. Your computer will try to connect to the Nokia 3650.
It's normal to see an error dialog soon after the connection is attempted. The Nokia 3650 will "callback" and try to connect to the server port. You'll see the mRouter icon in the system tray changing to this:
Click the Back button and you'll see the Nokia 3650 is now connected. Once the connection is established, the user can browse the internet from the Nokia 3650. At DSL or Cable speeds . The mRouter acts like ICS and establishes a pass-through connection. Very handy when you have to download big files and don't want to use the time on GPRS connections. Some applications will insist in connect to the GPRS provider (the ones where the user defined a default connection), but some browsers (like Opera and Netfront) will be just fine!
When finished, you can disconnect by turning Bluetooth off in the phone, or by opening My Bluetooth Places, browsing to my device and double-clicking the icon corresponding to the current active Serial connection.
In the status dialog, just click the Disconnect button. Make sure you only click it once, because it changes from Disconnect to Disable and you might accidentally change the status of your service.