Cingular having US-wide network problems?

The Inquirer's Charlie Demerjian reports Cingular customer service has admitted to a nationwide problem with their network that manifests itself by intermittently dropping incoming calls right to voicemail, and — worse — without notification of incoming voicemail, either. Apparently, they can fix the problem manually if you ring them, although they haven't made any public statement about the supposed problem. Now, we're wondering what percentage of this story is disinformation, which part customer service-induced frustration, and whether or not there's any truth to it. Anybody else having problems on Cingular outside of the normal level of quality service?

[Thanks, David]