Viber will make you wonder why you even have a cell phone bill. The free service makes it easy for you to call anyone around the world...for free! Viber's app is pretty straightforward. It's designed to look like a normal phone call.
Users can send their contacts texts, photos and video messages as well. With 200 million users, the 2.5 year old start-up is a badly kept secret. That's up from 140 million users in December, and shows just how fast Viber is growing.
Viber is also great for conference calls. Connect with up to 40 participants. International calls won't cost you a penny. And it's ad-free.This free app is compatible with iPhone, iPod touch, and iPad, but requires iOS 4.3 or later. It is also available for Android. --Written by Katie Roof in New York--