I do not use AT&T in my lumia 1520... Is there is a way to remove their address book? It came from the WP 8.1 image.
It is already uninstalled all AT&T apps, is just that the address book is there. I tried pressing, holding to see if an option will pop up to uninstall it but nothing show up.Find it in your list of apps, long press and select uninstall.