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Free calls to 94 countries!

Free international calls from Korea to USA, China, Japan and other 91 countries! Forget about expensive bills for international calling and enjoy communicating with your loved ones abroad!

- Users of Korean carrier services can enjoy free calls to 94 countries around the world
- Using only premium roots without paying any fees for installation, registration etc.
- Call abroad but pay based on domestic rates

More than 5 million people all over the world using OTO Free International Call

The leader in international calling in Korea with more than 5 million OTO users around the world! Any smartphone user can enjoy free international calling anytime.

Crystal clear voice quality, the best calling experience

OTO never sacrifices the voice quality like other international calling apps and services do!

Countires supported for free calls