Nowadays, smartphones are becoming more and more powerful and the Internet is becoming more and more popular, so free VoIP applications on cell phones are becoming more and more popular. I believe that many people have tried to install QQ, Skype and other voice chatting tools on their cell phones, but unfortunately, many of them can only be used in high-speed WiFi or 3G networks to achieve smooth calls. Today I'd like to introduce you to a communication software called Viber.

Viber is a cross-platform VoIP and instant messaging software for smartphones that works on 3G and WiFi networks. Viber was first launched on the iPhone, and Viber users can communicate with each other for free without registration or payment, as long as both parties have the software installed. Users can talk and send text messages, pictures, videos and audio media to other users for free over wireless networks or UMTS.

The most important feature of Viber is that users can make VoIP calls directly without opening the application. In 2010, Viber was first launched in a version that ran on the iPhone, and in May 2011, developer Viber Media released a beta version of the app for Android on the Google eMarketplace. On July 20 of the same year, the official version for Android was launched.

The biggest highlight is that even in mobile GPRS network, it can still talk smoothly and clearly! This is the main reason why I recommend it. Moreover, it supports Push notification mechanism, so you don't have to start the software or stay online in the background, others can call you through Viber. The phone will automatically receive push notifications and ring alerts for incoming calls, and Viber will be activated only after you answer. So if you are interested in Viber, come and have a try!