The ability to put a call on hold and answer another call is built into the default phone apps on Android phones and iPhones.

Though it is an instant messaging app, it also allows us to make audio and video calls. Although Whatsapp has supported on desktop, it has more focused on mobile platforms such as Android and iOS.

In its current implementation, whenever you answer a video call on WhatsApp, the call defaults to your front camera. If you're, for any reason, not interested in showing yourself on camera, you ...

WhatsApp beta version (2.25.7.3 for Android), as pointed out by Android Authority, reveals a countermeasure — one that will give you the option to answer a video call with your camera off.