AT&T: iPhone is unable to view new voicemail
Posted by Apple - Support - Most Recent - iPhone on Monday Jun 28, 2010 Under All, Support|
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iPhone displays an "Inbox is full" message when attempting to check voicemail. This message indicates that your AT&T voicemail box is full, so you need to delete messages that are stored on the AT&T voicemail server.
This article explains how to ensure that you are deleting voicemail messages that are currently stored on the AT&T voicemail server.