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If you use the Skype mobile app or desktop app, you can have private text conversations and voice calls. Private conversations have full end-to-end encryption, so they're more secure than standard messages.

Because they are designed to be secure, private conversations aren't copied or shared between devices in the same account, so you can't continue a private conversation on a different device.

3. In the pop-up window, choose the contact you want to chat with.

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1. Open the Skype app and tap the New Chat icon (it's shaped like a pencil).

4. If this is the first time you're having a private conversation with this person, an invitation will be sent automatically, and the conversation will start after the invite is accepted. If you've already had a private conversation with this person on this phone, you can start messaging right away.

1. Start or continue a private text conversation.

3. In the pop-up window, choose "Private call."

1. Open the private conversation on your phone or computer.

Original post:
How to use private conversations on Skype to send encrypted calls and messages - Business Insider India