Nope, only FaceTime had the ability to show native call interface.
Previously, WhatsApp showed you a notification when you get an incoming call (if app closed / minimized).
Seems iOS 10 is allowing apps to take over the screen for calls (just like they did on iOS 9 with reply via notification which was only available on iMessage)
Previously, WhatsApp showed you a notification when you get an incoming call (if app closed / minimized).
Seems iOS 10 is allowing apps to take over the screen for calls (just like they did on iOS 9 with reply via notification which was only available on iMessage)