FREE CALLS FROM NIMBUZZ

I think Nimbuzz is the oldest app in this list but with a great features.This is app running on since Java phones to latest Android, iOS and Blackberry devices.It support all the major platforms including Java.It provide free calling with HD-voice quality and 3G connectivity also.It imports contacts from social networking sites like Facebook, MySpace, Yahoo messenger and many other.After downloading these you have to make a account on Nimbuzz and this not allow you to call for free to your nimbuzz friends but also allows you to chat with your Facebook Friends also
               
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