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://payannamenik.farafile.ir/file/26945/جزوه-خلاصه-اصول-و-روش-تحقیق-1-(-دانشگاه-پیام-نور-)