You can invite someone to Signal using the "Invite Friends" menu in the app, which will send a text message or email.

We hear Signal is in the news. As longtime fans of the app, and secure messaging more broadly, we feel like it's our duty at Engadget to ensure you know how to use the software properly. Download ...

If you hadn’t heard of Signal before Monday, chances are you have now. The secure messaging app, available for iPhones and Android devices, has long been popular with journalists because of its robust ...