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://ucivil.ir/blog/1395/11/25/سوالات-استعداد-تحصیلی-دکتری-91-فنی-مهندس/