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Developer: Viber Media
Compatibility: Compatible with iPhone, iPod touch, and iPad.Requires iOS 3.1 or later. Android.
The Viber application is compatible across multiple platforms, including iOS and Android. It currently supports over 40 million users, who use the free app to call, text and send images across to other Vibe users across the world through WiFi or 3G.
If you download the app and want to know who is already on the platform, you can choose to synchronize your contacts to show you if your friends -- or your partner -- is already connected. For those on the road, it can certainly cut down the phone bill.