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://paishnahad.pdf-doc.ir/file/51088/طرح-درس-و-روش-تدریس-علوم-هشتم-فصل15-شکست-نور