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://unionline.farafile.ir/file/32243/مهندسی-سیستم-(تحقیق-در-عملیات)-استاد-مهدی-حمیدی