I have tried a few notification apps, like LedMeKnow ... and there is a thing I can't find: voice message notification. Most apps do missed calls; issue is that there are technically missed calls the phone is not aware of: when it's out of network. Some providers send SMS in this case. When the other party leaves a message, you get a message icon.
All I want is a LED + vibration reminder when this icon is on. And I can't find any app doing this.