Nokia Lumia 520
Find "settings"
Press the phone icon.
Press the dots in the bottom right corner of the display.
Press settings.
Turn off default voicemail number
Press the indicator next to "Use default voicemail number" until the function is turned off.
Save the voicemail number
Press the field below "Use default voicemail number".
Key in +447836121121
Key in +447836121121
Return to the home screen
Press the Home key to return to the home screen.
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