Besides calling, is there a way online to find out if the stores in your area are actually corporate stores or are resellers/franchise? As you know, some resellers use all the AT&T branding and appear corporate.
I noticed that the Corporate stores won't be capitalized and the Franchise ones are all capitals. All the Corporate store have It like this ( Cingular Wireless ). I was wondering too and I found out by knowing my stores and the results were true.
If your local listings are unclear, use the Google Earth .kmz that can be downloaded from this page. According to AT&T, it only includes company-owned stores.