It looks pretty legit...
http://www.att.com/fraud/home.html#four
Placing International Calls Without Realizing It
It?s not always easy to tell if you?re dialing an international telephone number. In most cases, you have to dial "011? to begin a call to a foreign country. But there are locations outside the U.S. whose telephone numbers may look like domestic long-distance calls, but they are actually international calls and international rates apply. For example, 809, 284 and 876 are area codes in the Caribbean.
There are many scams that deceive consumers into calling international numbers. You may see an ad for a service that directs you to call a specific number, or you may receive a page, an e-mail message or an ?urgent" message on your answering machine. All messages direct you to call a number for more information ? almost always an international number.
Defense:
Be cautious about area codes you don?t recognize. Check your telephone directory or call the operator to determine where the area code is before making your call.
Control access to your telephone so unauthorized callers do not use your phone to call these services. A block on calls to "900" services will not stop calls to "011" or "809" numbers. If you?re sure you won?t need to make international calls, call your long-distance carrier and ask them to put an international block on your telephone line.