Calling to Vietnam from Japan
によるポスト Anna Itoshima に 日本 フォーラム
There are many voip apps these days, like skype, viber, tango, facetime. I use Global Call for both my work and private calls. They run many promotions, currently pizza event in Japan. You can get free 2 pizzas if you purchase credit. Call quality, connections are fair. (www.globalcallevent.com)