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://interfile.ir/file/27583/پاورپوینت-تترازول-(خصوصیات-کاربرد-و-روش-سنتز-آنها)