You will have to have a AT&T prepaid card. Basically you can get the prepaid with a cheap crappy phone at places selling one (Walgreens, Walmart, etc) Then you register with the phone the card came with then just take the prepaid sim card out of the current phone and place it into this phone. you wont have a problem as long at you have a AT&T prepaid sim
The LG Vu is a super sexy touch-screen phone with a 3-inch display and haptic feedback. Features include AT&T Mobile TV, HSDPA speeds, a 2.0-megapixel camera, a full HTML browser, and quad-band support.