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://emadz.farafile.ir/file/30124/جزوه-فیزیک-سال-یازدهم-رشته-ریاضی-و-فیزیک-و-علوم-تجربی