To receive voice messages, you need to divert your calls to your voicemail.
Press the phone icon.
Press the menu icon.
Press Settings.
Press Call settings.
Press the name of the SIM.
Press Call forwarding.
Press the required divert type.
901
901
Key in 901 and press ENABLE.
If you divert missed calls, you need to select a delay for the divert. Press the drop down list next to 'Delay' and follow the instructions on the screen to select a delay for the divert.