I know the default for voicemail is the last 4 of the phone number. But when you first set it up, you have to change it. If the last 4 of your phone number aren't working, that indicates to me that you changed it sometime in the past. I'm not sure how you go about recovering it (probably can't) or creating a new one (most likely scenario), but it would have to begin with a call customer service.
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