So they just sent out marketing emails to us about this at work.
Unity lets you call other people with AT&T service without using your minutes. That service could be wireless, residential, or business.
Now that Cingular (Soon to be AT&T Wireless) is owned entirely by AT&T they are starting to do new things with their service plans. Everyone here at the office just speculates as to whats coming next now that things keep getting more and more streamlined. I just can't wait until IPTv gets to San Diego.