Signal – Private Messenger是斯诺登推荐的一款安全防隐私即时通讯软件，相对于其他软件，有着更高的隐私保证。Signal是一款开源软件，功能上支持包括：即时消息、语音、视频、表情以及群聊等功能，如果你需要一款保护隐私的APP，我们推荐Signal！

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Privacy is possible. Signal makes it easy.

Using Signal, you can communicate instantly while avoiding SMS fees, create groups so that you can chat in real-time with all of your friends at once, and share media and other files with complete privacy. The server never has access to any of your communication and never stores any of your data.

Appstore下载地址：Signal – Private Messenger