Here is a list of compatible devices for the AT&T Code Scanner App:

Apple iPhone 3G, 3Gs, iOS4, iOS5

Android HTC Aria, Motorola Backflip, Motorola Flipside, Motorola Kobe, Motorola Flipout, Motorola Bravo, Motorola Atrix, HTC Inspire Samsung Captivate, Sony Ericsson Xperia

RIM Blackberry 9800, 9700, 9300, 9000, 8900, 8520, 8320, 9900, 9360, 9860