An application that allows you to make free international calls on your cell phone

pu1. I think you're talking about the OTO global international phone application. OTO currently provides free international telephone service to 94 countries in Korea, including the United States, China, Japan, Taiwan, Hong Kong, Thailand, Australia, and the United Kingdom. It's not exactly free, but there must be a subscription plan, so you can use the remaining free currency on the plan. If there is no free call time left, the domestic call fee will be charged

2017-12-21

OK