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 (prefix) 5 (your phone number)
Key in (prefix) 5 (your phone number)
Return to the home screen
Press the home icon to return to the home screen.