Microsoft has partnered with Signal, the secure messaging app that counts whistleblower Edward Snowden among its fans, to add end-to-encryption to Skype. That means that all your chat, files and audio messages will be securely transmitted through the service, and they’ll only be readable to you and the recipient. No one will be able to easily intercept them as they pass through Microsoft’s servers and parse them – similar to how messages on Facebook Messenger, WhatsApp, and Telegram work
How to Make Voice Calls on Signal on Android
This wikiHow teaches you how to make voice calls using the Signal Private Messenger app on Android. Signal is a free open source encrypted communication app that maintains your privacy. If the person you are calling also uses Signal, the call will be secured with end-to-end encryption that doesn't go through a central server. If the person isn't a Signal user, a standard call will be placed using your phone's default calling app.