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://rayanshahr.farafile.ir/file/24891/جزوه-درسی-سیستم-های-تصمیم-گیری-(dss)-دکتر-کاظمی-پور