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://www.bennubook.com/book/11358/کتاب-Finish-What-You-Start-اثر-Peter-Holins-ناشر-PH-Learning