EDIT: OOps! Sorry; just checked and it is ALL longdistance to othr ATT-ers.
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As an ex-ATT customer I also received this email promo from them. I no longer have it but seem to recall the flat rate MAY apply only to interstate calling. If you do intrastate calls, might want to check to make sure that is included.
For instance, I rarely call out of state but almost every LL call I make is longdistance due to my rural location (wireless is a lifesaver for me!)