IPhone 4 Voice mail Password?

My iPhone has been asking me for my voice mail password for a few days now, and I just haven't had the time to fix it so I've just been ignoring it. Now the notification won't go away and i can't access my phone, or even shut it off. Any ideas how to get it off?

Hold down the CIRCLE and POWER button until you see the apple logo (do not let go UNTIL you see the apple logo).

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