I'm stealing my headline from MG Seigler because I can't think of any better way to put it. I found out the hard way today that my iPhone voice mail has been down for several weeks, that AT&T has known about this, that they have not been able to fix it, and worst of all, that they didn't bother to let their customers know. This is a failure of staggering proportions. When I finally got caught up on all my voice mail messages it turned out that I had missed some really important ones, including a reminder from my mom to call my dad on his birthday (which I actually did forget to do -- sorry Dad!) God only knows what important messages other people having this problem may have missed.
Honestly, Apple and AT&T, it's not like this is some obscure feature that no one ever uses, this is absolutely central to the fundamental function of a phone nowadays. And how hard can it possibly be to fix?