Talkatone - the social phone and IM for GTalk (gmail chat) and VoIP Google Voice
FreeCan 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
Downloads: 153+ (for Android)
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for Android