1. Find "Call-forwarding settings"
Press the phone icon.
Press the menu icon.
Press Settings.
Press Calling accounts.
Press Call-forwarding settings.
2. Divert calls to voicemail
Press the required SIM.
Press the required divert type.
Key in (prefix) 5 (your phone number) and press Turn on.
(prefix) 5 (your phone number)
3. Return to the home screen
Press the Home key to return to the home screen.