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://ppt-r.farafile.ir/file/48270/گزارش-کار-آزمایش-جداسازی-zn2-از-ni2-به-وسیله-ی-تبادل-گر-یون