How to stop my voicemail password from popping up?

I have an iphone 4S and I have no clue what my voicemail password is but this notification keeps popping up all the time asking for my voicemail password even when I'm not trying to listen to a voicemail. I could be on a totally different app and it pops up. It's do annoying and it's been doing this for about a week. How can I fix this!

Take out the battery, that annoying message won't pop up without the battery in it!

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