Depends on the plan you have, with go phone I pay the same for texting international, just use (011) (country code) (area code) (number). For calling I guess it depends on your plan but you can check at that www.att.com site, just search for "international" in your plan.
Here are the rates for mine (I don't need to add anything):
http://www.wireless.att.com/learn/popups/PAYGO-international-long-distance-rates.jsp
Here is the page if you want to add the service:
http://www.wireless.att.com/learn/international/
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