1. Find "Voice"
Press the phone icon.
Press the menu icon.
Press Settings.
Press Calling accounts.
Press the name of the SIM.
Press Call forwarding.
Press Voice.
2. Divert calls to voicemail
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
Slide your finger upwards starting from the bottom of the screen to return to the home screen.