Voicemail says my mailbox is invalid when I enter my number?

    I noticed my voicemail on my Nokia Lumia 635 wasn't working when someone pointed out to me that when I get a call it doesn't go to voicemail like it should. I called voicemail and it said to put a * to check my mailbox then it asked for my 10-digit number. when I put in my number it said my mailbox is invalid. What do I do?

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