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/45911/جزوه-دستنویس-درس-مدار-1--استاد-میرحسینی(دانشگاه-صنعتی-شریف)