We have a network extender at our house because we live in a very bad service area. Only when I am at home, if someone calls me and leaves a voicemail for the rest of the day my phone will keep saying "Can't Connect to Visual Voice Mail" and vibrate what seems like every 10 seconds. It is driving me insane! How do I at least make it stop with the notifications every 10 seconds.
You should have a Voice Mail app button, under that is where you'll find the settings button. You should be able to turn off your notifications.