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://ucivil.ir/blog/1396/12/07/بررسی-آب-های-سطحی-و-تاثیر-آن-بر-کیفیت-آب/