OTO is a great application that provides internaional calls from KOREA. OTO lets you make international calls based on Korean telecommunication company (SK/KT/LGT).

OTO international call is..
a free international call service with no international call charges
A local call fee from the payment system of the user’s smart phone occurs, and there is no duplicate billing.
-mobile & phone
America,Singapore,China,Canada,Thailand,Puerto rico,Hongkong

-phone
Greece,Netherlands,Norway,NewZealand,Taiwan,Denmark,Germany,Luxembourg,Malaysia,Belgium,Sweden,Switzertland,Spain,Argentina,Ireland,U.K,Austria,Estonia,Israel,Italy,Japan,Czech,Chile,Portugal,Poland,France,Finland,Hungary, Australia,


OTO free international call Screenshots