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://shahre-online.farafile.ir/file/36125/جزوه-دستنویس-ارتعاشات--استاد-مرادی-(دانشگاه-صنعتی-شریف)