#23 – Viber
Viber is so popular nowadays that you could easily call someone with a smartphone that doesn’t already have this messaging app. Almost every single smartphone in the world has the popular Viber’s purple on its screen.
What Viber allows you is free calls with whoever has Viber and access to the Internet. You can talk with a fellow Viber user for hours via a stable Internet connection and you won’t be charged a penny. This app made a revolution in communications and had stopped the phenomena of expensive phone bills.