If you are using infrared to connect your Nokia 6600 to the PC, activate the infrared connection on the phone. Go to Menu, Connectivity folder and select Modem and follow instructions. Line up the infrared port of the Nokia 6600 to that of your PC. In Nokia Modem Options, select the infrared modem for your Nokia 6600.
If you are using Bluetooth to connect your Nokia 6600 to the PC, go to Menu, Connectivity folder and select Bluetooth. For the first time, you are asked to give a Bluetooth name to your phone and select Bluetooth On. Activate DUN or FAX profile in the Bluetooth software then activate Bluetooth device discovery from the Bluetooth software on the Nokia 6600. You will then need to pair the Nokia 6600 and the PC by entering a passcode into both devices. Your passcode should be 1-16 numeric characters long. This passcode is used only the first time you make the connection.
Agree to all connection requests between your Nokia 6600 and your PC. In Nokia Modem Options on the PC, select the appropriate Bluetooth modem for your Nokia 6600 phone and choose the Nokia 6600 connection settings and click OK. The connection between your PC and the Nokia 6600 is now ready.