Where the heck is Visual Voice Mail...

It's on the the right side of home screen, below the clock/weather widget and above Camera. It's actually VVM.
 
I would wait and try the update tomorrow if your having issues. If it's still not fixed call Sprint Technical Support by dialing *2 on your phone.

The LED on the left is the notification LED. In the middle is your ear speaker. The small 'LED' looking thing on the right is what I believe to be the light-sensor. This is what causes your phone to brighten and dim depending on the amount of light around you.

Hope this helps!