以上来源于: WordNet
Viber uses the latest in VoIP technology to offer completely free calling with superior sound quality.
ENGADGET: Viber VoIP iPhone app: 3G calling, no registration, and totally free
Viber is totally free to download and has no hidden costs, in-app purchases or in-app ads.
Mr. Marco said Viber is also talking to games companies about promoting games on its platform.
WSJ: The Messaging Apps Taking on Facebook, Apple
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