Hike Messenger could add voice-calling feature to app
Ringo, an app that lets you to make international calls without Internet launched in India
Hike Messenger acquires US-based voice calling app Zip Phone
WhatsApp will now integrate 'Call via Skype' feature: Report
Sharad Yadav raises concern over software allowing illegal calls
Airtel makes a U-turn: Will not charge extra for VoIP calls
North Korea blames U.S. for Internet outages, calls Obama 'monkey'
Airtel to charge extra for VoIP calls: Is it time to bid goodbye to free services?
Airtel to charge extra for making VoIP calls
Leaked WhatsApp screenshots show new voice-calling features
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