You're confusing "Android" and "Droid". Android is the name of Google's smart phone OS. Droid is the marketing name licensed from George Lucas for Verizon's line of Android powered smart phones. Currently none of the Verizon Droid phones will work on AT&T. AT&T's Android phones include: HTC Aria, Motorola Backflip (garbage), Sony Ericson Xperia X10 (obsolete), and the Samsung Galaxy S Captivate (easily the best of the 4).