Sometimes my iPhone stops notifying me when I have voice mail messages. When I go to the Voicemail tab in my Phone app, there are no messages displayed... just a button telling me to call in to check my messages.
To fix this problem, I login to Ting site; disable voicemail on my device; and then a few minutes later I enable it again.
During the most recent occurrence, there were messages out there for weeks I did not know about.
Why is this happening? How can I prevent it from happening again?