I have been making free Quality calls with Viber! Try it!

So you've got internet but no credit to make long international calls except with boring Skype. It's time you download viber. It's has an amazing advantage being a cross-platform software and can work well on both a 3G and wifi networks regardless whether you are on a bb, Iphone or Android without increasing your data costs. Viber has simplicity that allows you to switch to traditional GSM networks when you so desire and access wifi to make quality calls (better than Skype!).

Viber was initially launched for iPhone on Dec 2 2010, in direct competition with Skype. A pre-release version for Android appeared in May 2011 but was restricted to 50,000 users; an unrestricted version was released on July 19, 2012. Viber for BlackBerry and Windows Phone devices were launched on May 8, 2012. Now it's on all the major platform including Symbian and Bada.
Viber is a proprietary cross-platform instant messaging voice-over-Internet Protocol application for smartphones developed by Viber Media. In addition to text messaging, users can exchange images, video and audio media messages. The client software is available for Android, BlackBerry OS, iOS, Series 40, Symbian, Bada and Windows Phone. Viber works on both 3G and WiFi networks.
Viber reached 175 million users as of February 26, 2013..wiki.