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.
http://daneshjo.farafile.ir/file/35896/پاورپوینت-رسم-دیاگرام-فاز-سیستم-دو-جزئی-اب-و-فنل