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://pdf-doc.ir/product/14543/دانلود-سوالات-آزمون-مرحله-اول-المپیاد-کامپیوتر-بهمن-1391