iPhone voicemail notice outside cellular service, but no msg when in service area? I am often in remote areas without cellular service. I do get wireless connection, and every so often my iPhone4S (iOS9.3.5) displays a notification on my phone service (the red dot without a number):  

  

When I get to a cell service area, however, there is no message.  

Is this red dot indicating a voice message has arrived?

Is the notice a mistake?  

Has an actual voice message been deleted?
I always thought the red dot without a number means your Voicemail service is unavailable, not that you have Voicemail waiting.

I spend a lot of my time outside reception areas, or abroad with no roaming, &amp; I have that icon the entire time I'm away; whether or not I have voicemail waiting for me when I get back [usually I don't].