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To receive voice messages, you need to divert your calls to your voicemail.
Find "Call forwarding"
Slide two fingers down the display starting from the top edge of your phone.
Press Call settings.
Press Call forwarding.
Select divert type
The current settings are displayed.
Press one of the following options:
Forward when busy
Forward when unanswered
Forward when unreachable
Divert calls to voicemail
Key in +447836121121 and press Enable.
Return to the home screen
Press the home icon to return to the home screen.