KAKAO talk is very famous in the western countries and instead of the other software and application, they people use KAKAO talk. You can easily talk with other people on voice calls and it is totally free. You can easily install this application in your computer and smart phone and talk with people who use this application. You can only communicate with people, if another person also keeps the same application in the smart phone or computer. Basically, this application first launched for a smart phone, but later is was made compatible for computer and other devices.