Would this mess up my Contract with AT&T?

If I got an iPhone 5 from walmart (i'm due for an upgrade), but i'm worried… Would this screw up my contact with AT&T

No… LMFAO!

Walmart, best buy, radioshack, wirefly, amazon, etc etc etc are all national retailers… They help the wireless carriers sell their phones and their contracts… Getting an upgrade from a national retailer is like walking into the corporate store itself