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.
[寫給新手] 如何以回復方法升級 iOS (安裝IPSW檔) https://qooah.com/2013/01/31/how-to-restore-upgrade-ios/