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://farathesis.farafile.ir/file/24727/پاورپوینت-جزوه-کامل-درس-تنظیم-شرایط-محیطی-2