oh you don't have the complete manual
anyway do the following
- press "HOME", then press "MENU" and then press "SETTINGS"
- IN mobile network section, select "call settings"
- wait for settings to be downloaded from network
- Go to "call Forwarding"
- check it's status
- Change it to "Forawd when unaswered"
- Repeat step one
- Select "additional call settings"
- Check Call waiting option (unchecked box means, caller ID will not be displayed)