After the launch of WhatsApp Web there is another great news, the most popular messaging app WhatsApp will be having a voice service called WhatsApp Voice.
Everyone is waiting for that particular feature in the app, we have already many guides to activate the interface calls with the help root permissions on the internet, but today we will tell you a new method that anyone can perform even with Root.
The method is a modification of the manifest of WhatsApp that goes well to activate the UI: to simplify the task we propose a modified apk already, that you'll just have to download and install. But we want to emphasize that you can not still use voice calls, but only see the interface and implementation currently present, since it is necessary for someone with active calls will call in turn to ensure that they work to you.
Download WhatsApp with UI active voice calls
Source : XDA