If you've set up voicemail, you'll see 
Do one of the following:


If you listen to a new message and disconnect from voicemail without saving or deleting it, you will still see 
Your carrier provides your voicemail system.
Do one of the following:



Contact your carrier for help with:
If 
First, force stop the app:


Touch Force stop.
This restarts the app and should remove the notification.
If that doesn't help: