EDIT: FIXED now! Thanks all!
So I plug in my phone and it goes through its updates a while ago.
And everything works.
Except one thing.
It keeps asking me for the "password" to my voicemail.
I have no idea if ever set such a password, or if I did, what it was. It's been years since I first set that up.
What happened, and how do I get my password back?