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://aketabha.farafile.ir/file/49311/پاورپوینت-بررسی-روش-ها-و-ایمنی-تخریب-در-ساختمان-ها