WhatsApp’s voice calling feature is now available to all Android users. The world’s most popular messaging app with over 700 million monthly active users only introduced this feature recently and rolled it out gradually to its Android users. If you are not an Android user, you’ll just have to wait a little longer to get this feature. But if you use Android, and haven’t yet activated voice calling on WhatsApp, what are you waiting for?
The process isn’t as simple as updating WhatsApp to start using the voice calling features. It involves a couple more steps that you need to follow. We’ve described these below, so take a look to enable voice calling on WhatsApp for Android.
- Download the latest version of WhatsApp for Android from here. The latest version on WhatsApp’s website is 2.12.7, but if you’re downloading from Google Play, ensure that your device has version 2.11.561. Older versions don’t support this feature for all users.
- Once you have the latest version of WhatsApp installed on your Android phone, ask someone who has WhatsApp calling enabled to make a WhatsApp call to your number.
- Multiple users have reported that giving a missed call doesn’t work. You’ll have to receive the call and wait for a few seconds before disconnecting to activate WhatsApp voice calling.
- When the feature is enabled on your smartphone, you’ll see a new three-tab layout on WhatsApp, one each for Calls, Chats and Contacts.
Credits:
http://gadgets.ndtv.com/apps/features/how-to-activate-whatsapp-voice-calling-670962
Bloom Mobiles 
I had installed whatsapp 2.12.7 version in my android phone. My phone model no is Micromax doodle 3 A102.
I told my friend to call from whatsapp voice call and he called me. But even after receiving the call I can’t see the calling option/ symbol on my whatsapp page. Request you to please resolveresolve these problem asap.
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You will have to download the latest version (2.12.12) of WhatsApp for Android from the company’s official website.
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