Is this a new phone? May not have been properly provisioned on the wireless side. This is a customer helping customer forums with a couple of community managers, that are employees of AT&T. Call customer service and let them know your problem.
This is a user to user forum. I am a user, just like almost everyone else on the site.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.