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.
这句提到的“作证”指出什么? https://www.gulanjingzhidao.com/zhe-ju-ti-dao-de-zuo-zheng-zhi-chu-shen-me-%ef%bc%9f/