iphone 4 keeps prompting for a voicemail password when i never set one up

iPhone 4 keeps prompting for a voicemail password when I never set one up.
location: macrumors.com - date: July 20, 2010
Has anyone else have this issue. Just started to happen to me today. I open up my phone app and go to voicemail and it says incorrect voicemail password. Is there a way to get rid of this? I never set a voicemail password up. Well I'm pretty sure I didn't. This just started happening and I have never seen this before until today. Wondering if anyone has fixed this before. Please post if anyone knows. Thanks!
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