When you click on the button, the recipient on the other side will receive a message requesting whether they like to switch from the voice call to a video call.
Well, while that sounds cool, there is one more step involved. The rollout timeline is still unknown though.
The report suggests that a new button pops up on the screen while in a voice call. Here's how it works in real life.
However, you might be anxious right now to say what if someone just switches to a video call during your voice call and you're in the wrong environment? This consumes a lot of time, and WhatsApp - though late - has now realized that. It can now be done by taping a single button in the in-call UI. It is not a great way to instantly switch to video when you choose to.
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However, it should be noted that the button is only visible when a user is on a call via WhatsApp, or at least that is the case in beta. If the request is rejected, then the voice call will continue as before. The same procedure applies in switching between a video call to voice call. We might see group calls in the future, as there is a hidden string in the update that says: 'Couldn't switch between voice and video call because this feature isn't available in group call'.
When the company recently announced its live location tracking feature, the presentation included a graphic that clearly showed icons for both voice and video calling inside a group chat.
To get hold of the update you'll need to be part of the Google Play Beta Program, which will give you access to the 2.18.4 beta version of Android which will facilitate the running of the WhatsApp beta update. The feature was first spotted by WABetaInfo and it seems, the messaging application is now only testing this feature, collecting feedback from the beta users to make it work better.