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://sciences.farafile.ir/file/42033/تحقیق-عوامل-مؤثر-بر-اثر-بخشی-دوره-های-آموزش-ایمنی