If anyone needs to get WhatsApp calling feature enabled on your Android device. Let me know ASAP. (Whatsapp server gates are open at the moment..)   Edit: Make sure.. you have latest version of Whatsapp. 2.11.561  Version may differ according to device brand/model/make..    Edit 2: This feature will only work on Android devices.   Edit 3: iOS and Windows users can only receive calls made from Android device via Whatsapp.. not vice-versa.   
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