Ali.Pakistani
Senator (1k+ posts)
A few weeks ago, WhatsApp's Call feature made a small appearance for a few users, but at the time almost no one was able to trigger it reliably and keep it activated. The company appears to have flipped a few switches in its servers and the function is confirmed to work for those running version 2.11.528 from the Play Store, or 2.11.531 from WhatsApp's website.
So as you are suspecting, the "invite" or, more accurately, the trigger that enables the feature has to be the reception of a call from someone who already has it. (Or maybe this terminal trick still works, I'm not sure.) Once that happens, WhatsApp's UI switches (either immediately or after you exit and reopen the app) from just showing chats, to a 3-tab layout with calls, chats, and contacts.
Calls are well integrated in WhatsApp. The dedicated tab shows incoming, outgoing, and missed calls with precise timing. Ongoing calls stay in the notification panel until you hang up while missed calls leave a notification that you can later check out. While on a call, you can activate the loudspeaker or mute the microphone. If you open your text chats with any contact, a call button appears in the action bar, right next to the attach icon and the menu, to make it easier to talk to them. And finally, if you click a contact's avatar, you now get a bigger profile image with the options to message or call them, or view their information.
When you're lucky enough to receive a WhatsApp call from a friend, you can go on enabling the feature by calling your other contacts. If they're running an older version of the app that doesn't support it, you will instantly see a message notifying you of that so you can tell them to update their app before you call them. Now all you have to do is cross your fingers and hope that someone shares the riches with you so you can spread them further.
Source


So as you are suspecting, the "invite" or, more accurately, the trigger that enables the feature has to be the reception of a call from someone who already has it. (Or maybe this terminal trick still works, I'm not sure.) Once that happens, WhatsApp's UI switches (either immediately or after you exit and reopen the app) from just showing chats, to a 3-tab layout with calls, chats, and contacts.
Calls are well integrated in WhatsApp. The dedicated tab shows incoming, outgoing, and missed calls with precise timing. Ongoing calls stay in the notification panel until you hang up while missed calls leave a notification that you can later check out. While on a call, you can activate the loudspeaker or mute the microphone. If you open your text chats with any contact, a call button appears in the action bar, right next to the attach icon and the menu, to make it easier to talk to them. And finally, if you click a contact's avatar, you now get a bigger profile image with the options to message or call them, or view their information.
When you're lucky enough to receive a WhatsApp call from a friend, you can go on enabling the feature by calling your other contacts. If they're running an older version of the app that doesn't support it, you will instantly see a message notifying you of that so you can tell them to update their app before you call them. Now all you have to do is cross your fingers and hope that someone shares the riches with you so you can spread them further.
Source
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