This messaging app wins on every front, except the one that matters

I want to switch to Signal because it's simple and secure, but all my contacts are either on Viber or WhatsApp.
Business Wire

Viber Releases Desktop Version – You’ll Want to Sit Down for This

LONDON--(BUSINESS WIRE)--Viber, (www.viber.com) the leading mobile communications platform offering free messaging and HD-quality phone calls, announces today the release of Viber Desktop for PC and ...
Liliputing

Viber iPhone app now lets you send text messages for free, Android app coming soon

Viber is an app that lets you make free voice calls to other Viber users over the internet. The app only hit the App Store recently, but version 2.0 is now available. Previously, the app only allows ...