Mobile Apps WhatsApp Calling
Mobile Apps 
Messaging app WhatsApp Group Video and Voice calls start rolling out on Android
Web & Social WhatsApp is getting Group Video Calls and support for stickers
Messaging app How to improve on the quality of your WhatsApp Calls
Mobile WhatsApp Calls vs normal voice calls, which one should you use?
News Voice call update: You can now call using WhatsApp for Windows Phone
Mobile Here’s how to get Whatsapp with Voice calling without an invitation
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