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Message Waiting Indicator Your phone's message waiting indicator is either a light or special tone that alerts you when you have voice mail.
Occasionally, the message waiting indicator may be out of sync with your mailbox. In that case, the indicator light or tone is ON but there are no messages waiting, or the indicator light or tone is OFF when there are new messages waiting.
To get the message indicator back in sync
Instructions for FiOS Digital Voice Calling Features