At least on iOS, internet call is treated basically the same as cellular, showing a splash caller screen and ringing if not on silent. This means that it's trivial to setup phone in such a way that no notification gets through but calls do, even with sound.
(3rd world) problem: most people think calling is pressing the phone button inside Whatsapp.
At least on iOS, internet call is treated basically the same as cellular, showing a splash caller screen and ringing if not on silent. This means that it's trivial to setup phone in such a way that no notification gets through but calls do, even with sound.
The point being made above is that if data is turned off, you can no longer receive calls made over WhatsApp.
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This is also true on Android.
The same in Switzerland and it's not 3rd world