Here's my thread where I posted the Visual Voicemail Fix: http://forum.xda-developers.com/show....php?t=2738057
We need a fix for the Wifi Problem
So it turns out that your Voicemails won't download when you're connected to a Wifi Network. The app seems to default it's connectivity to Wifi when both a Wifi and Mobile Data Connection are available. As soon as you move away from your wifi connection or disconnect, your voicemails will immediately download. We need a hard-core developer to debug this. It's a function of what connection Visual Voicemail should default to when checking for voicemails, and that connection should probably be cellular data.