Mine works just fine on 4G right out side San Jose today. I have grandfathered unlimited on both my iPhone 5 and iPad 3. Even works with LTE off on my iphone 5 and iPad 3.
I let the kids FaceTime with the grandparent about 30-45 minutes today.
I'm glad AT&T is starting to let me use what I pay for the way I want to use it.