Hi there
At this time, international roaming in countries other than Mexico or Canada is unavailable for GoPhone. You may want to check out our GoPhone support page here - http://www.att.com/esupport/gophone.jsp?cv=821– which offers guidance on calling and texting internationally.
For more information about International calling features for GoPhone, click on the link below:
International Long Distance Calling
I hope this helps!
Charise