Looks like I'm having the same problem as others. Many of my voicemails aren't downloading. I can see that someone has called but there's no notification that they've left a voicemail and it doesn't show up in visual voicemail. When I call *86 I'll have a new voicemail. This seems to be sporadic as some will come through fine. I have an iphone 8, current iOS. I tried resetting network settings and that didn't help. I've never had problems in the past but I've noticed this is the past few months. Any ideas on how to fix this issue?