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://dlweb.farafile.ir/file/14574/نمونه-پروپوزال-دوره-هاي-امنيت-شبکه-و-سيستم-هاي-عامل-کد-باز