only in us and only with at&t. To be honest I really haven't had that problem abroad. Now I'm not on voip for hours on end. It works good. I just got back from China and I installed a dlink portable wireless in my hotel room and made quite a few skype calls with no problems. The best was Berlin they seem to have blanketed the city with wifi spots. Boingo was there but I used a local provider that charged me 6 euros a day and 15 euros for a full seven days of unlimited anywhere wireless data!