Talkatone - the social phone and IM for GTalk (gmail chat) and VoIP Google VoiceFree
Can you talk over GTalk?Talkatone is a free Google Talk client with iOS4 backgrounding and local notifications which offers exciting Instant Messenger, Voice Calling over WiFi and 3G and Location Sharing features. And its not just for iPhones, using
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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