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To receive voice messages, you need to divert your calls to your voicemail.
Find "Call forwarding"
Press the phone icon.
Press the menu icon.
Press Call settings.
Press Call forwarding.
Select divert type
The current settings are displayed.
Press one of the following options:
Divert calls to voicemail
Key in +447836121121 and press Turn on.
If you selected Unanswered in step 2, you need to select a delay for the divert:
Press the required delay.
Return to the home screen
Press the home icon to return to the home screen.