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://daneshfile.farafile.ir/file/37389/پاورپوینت-سیاهچاله-سفید-چاله-و-ستارگان-نوترونی