How to change voicemail password on straight talk iphone 4?

I have an iphone 4 from att that I switched over to straight talk over a year ago. I stopped using it for a long time and gave it to my mom who just started it up again. I can't remember what it is… How can I reset it again?

If you have a new phone number you will have to set up the voice mail. Dial *86 from your phone. This will prompt you to set up your voicemail.
If you have the same phone number, you should dial *86 and see what is said. They may give you instructions on how to reset your voicemail box number.

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