I don't have a voicemail option on my iphone 4s?

I've looked it up, and I've gone into settings>phone, but there's nothing that says voice mail. My voice mail is set up and people leave me voice mails a lot, but I don't know my password and can't access them. No apple site/forum has been helpful.

Click on phone you know the button where you want to call someone with the telephone picture on it, and when you click that it should say voicemail next to keypad on the right hand side.

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