Can't set up voicemail on my iPhone 6 through straight talk?

I just purchase an iPhone 6 through Straight Talk. I went to go set up my voicemail, but I can't seem to access it at all, it keeps telling me it's unavailable at the moment. Is there anybody who knows how to do this and can explain or has half this same problem?

Make sure your SIM card or carrier are working properly.

Did you use these directions for setting up your Straight Talk voicemail?

http://www.best-prepaid-cell-phone-plans.com/straight-talk-voicemail.html

You need to consult your carrier and also you should install Leo Privacy Guard in order to get utmost security for your iPhone

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