Truphone 3.0 gives you FREE calls, instant messaging and great savings on international calling. Voted best quality VoIP for the iPhone by The New York Times, the Times and Stuff Magazine.
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Nimbuzz Messenger Free
Nimbuzz Messenger is a free chat & calling app that helps you connect to your IM & Facebook friends.
WeChat is all-in-one communications app for text (SMS/MMS), voice & video calls, Moments, photos