Let me correct myself. I meant to say I think I know why it's doing that. I troubleshoot issues like this everyday and sometimes it's a quick fix but other times it takes days to resolve. As a customer there is nothing you can do other than complain to customer service and since I don't work for Cingular I don't know if their network is setup the same as Sprints. It's possible the problem might just go away because if there were like thousands of people all trying to access their voicemail at once it could block your call or route it to somewhere else.