1. Find "Voice call"
Press Phone.
Press the menu icon.
Press Settings.
Press More settings.
Press the required SIM.
Press Call forwarding.
Press Voice call.
2. Divert calls to voicemail
Press the required divert type.
Key in (prefix) 5 (your phone number) and press ENABLE.
(prefix) 5 (your phone number)
3. Return to the home screen
Press the Home key to return to the home screen.