Killer app alert. Viber works in Thailand if you have and iPhone. It needs permission to use your existing phone book, and once it has that looks for others who have the app. If they do, free calls VOIP calls (if using wifi/3G). Yeah, it’s kind of like Skype and Google Voice and What’s App, but it’s really easy to use, giving it an edge on the competition.
Here’s a how to, not that it’s needed: