[Arubalisa]

http://www.wireless.att.com/learn/international/roaming/international-roaming.jsp

Your phone must be activated for international roaming & your phone compatible.

"Use our NEW Wireless Travel Guide to see if you'll have coverage based on your device and itinerary. Or use the drop-down boxes below to look-up coverage information.
Getting Started

Select your destination country from the list below.

1. Determine if your wireless device will operate in the
   country you are visiting.
2. Activate international roaming for your account."

"Roaming:
Calls Placed/Received While in Aruba
AT&T Standard International Roaming $1.99
AT&T World Traveler $1.69
AT&T Canada $1.99
AT&T Mexico $1.99

Text, Picture and Video Messages:
Data Usage: All GPRS pay per use rates are $.0195/KB, except in Canada rate is $.015/KB
Text, Picture and Video Messages: Send Text Message $0.50 per message sent
Send Picture and Video Messages $1.30 per message sent
Receive Text, Picture and Video Messages-- Home pay-per-use or package rates apply to all text, picture or video messages received when roaming internationally. Please visit www.att.com for details."