Communicate with friends and family using KakaoTalk for Android. Enjoy unlimited group chats and send photos, videos, and voice notes. Make free calls using 3G, Edge, or Wi-Fi. Schedule appointments, see who read your messages, and multitask.
You should really try Kakao Talk if you have not!!!
Now here is the Guide for Kakao Call&Text Free guiding you to utilize the full potential of Kakao Talk!!!
This application will guide you how to make your phone for video call same application.