Voice mail notifications disappear on my iPhone

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?  




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