1. enable bloototh in handset (probably in Data menu), assign BT device name and check "Visible to others"
2. go to machine Bluetooth configuration, refresh Bluetooth places and Add your handset device to list
3. select virtual COM port assigned to "Bluetooth serial port" or "Bluetooth modem" in "Client applications"
4. initialize Bluetooth connection from handset side or from machine side as "Bluetooth serial port"¨. To establish connection first time you must entry the same numbers (PINs) at both handset and machine side
5. Use COM number from 3) for TComm.DeviceName property

Note: It was not possible establish connection to Nokia 6600 via Dell Quick connect/Bluetooth serial port but via "Dial-up networking" - handset is in modem list (and virtual COM port is assigned and indicated)