Switch this toggle on to start making calls over Wi-Fi, even when you have no phone service This article explains how to use Wi-Fi calling on Android and why you might prefer it over traditional calls ...
We are becoming less and less dependent on mobile networks. You can get a data signal almost everywhere that you can get a mobile signal and most of us are around WiFi most of the time anyway.
Earlier, WhatsApp Web was primarily limited to messaging and file sharing, and users had to install the WhatsApp desktop app to make voice or video calls from a computer.
You'll need to enroll in the beta to try it early.