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International Call / SMS

Enjoy the best quality international calls with no worries about bill shock!

Free calls to 94 countries from Korea
The Best Quality International Calls to 250 Countries at the Lowest Rates with OTO Credit/Subscription
Make Calls at Low Rates from OTO to Landlines or Non-OTO Users

OTO Number

Get your own OTO Numbers, and make and receive calls without showing your mobile phone number.

Manage your business and personal life with OTO Numbers with low-cost plans at no extra charge.


Enjoy the best quality international calls and multimedia chats with OTO users in any country!

Free HD quality calls with OTO users based on the industry-leading technology
Unlimited calls and chats anywhere in the world over Wi-Fi or data
Free text, multimedia messages with photo or video and location-sharing with OTO users