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.
https://9lib.co/document/7qv1dk1q-多頻道多標準無線通訊系統關鍵射頻技術之研發總計畫I.html