Cause 4 of 4: The voicemail number is not saved in the phone
To use a shortcut key to call your voicemail, the voicemail number needs to be saved in the phone.
Solution: Save the voicemail number.
(prefix) 5 (your phone number)
(prefix) 5 (your phone number)
(prefix) 5 (your phone number)
1 Find "Voicemail number"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press Call.
Press Voicemail.
Press Voicemail settings.
Press Voicemail number.
2 Save voicemail number
Key in (prefix) 5 (your phone number) and press OK.
(prefix) 5 (your phone number)
3 Return to the home screen
Press the Home key to return to the home screen.