End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
Swift(스위프트): 인터넷 접속 여부 판별하기 (WiFi & 셀룰러 LTE, 5G 등) http://yoonbumtae.com/?p=4639