I have a samsung freeform and it's asking me for the temporary password to my voicemail. Any ideas?

I just recently got a samsung freeform from the company Metro PCS. A few people left me a voicemail, and today I just got to checking it and setting it up. However, when I went to check it, it told me that I had to type in my temporary password, and I didn't set one up. Any ideas as to what it could be? Does the phone just come like that? Thanks !|||Metro pcs temporary voicemail password is 9999

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